Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cam thuc » am thuc, nam thuc, cam thu
cau treo » cau theo, cau tren, cau trieu
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
va lanh » va lang, va danh, va hanh
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly vang » ly hang, ly van, ly quang
van cam » van nam, van lam, van cau
ma hoi » mai 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: vu sach ly vang ((ma hoi) or (xa hoi)). hieu van cam thuc va lanh hai ((cau treo) OR (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly vang ((ma hoi) OR (xa hoi)). hieu van cam thuc va lanh hai ((cau treo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ly vang ((ma hoi) or (xa hoi)). hieu van cam thuc va lanh hai ((cau treo) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ly vang ((ma hoi) or (xa hoi)). hieu van cam thuc va lanh hai ((cau treo) OR (cau triet))*.