Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau trieu
dinh hai » dinh thai, tinh hai, dinh ha
cam thuc » am thuc, nam thuc, cam thu
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau
ma hoi » xa hoi, ma hoa, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly nang ((ma hoi) or (mai hoi)). hieu van cam thuc va dinh hai ((cau treo) OR (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ((ma hoi) OR (mai hoi)). hieu van cam thuc va dinh hai ((cau treo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang ((ma hoi) or (mai hoi)). hieu van cam thuc va dinh hai ((cau treo) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ((ma hoi) or (mai hoi)). hieu van cam thuc va dinh hai ((cau treo) OR (cau triet))*.