Perhaps you should try some spelling variations:
dinh thai » dinh thi, sinh thai, tinh thai
cau treo » cau theo, cau tren, cau triet
dinh hai » tinh hai, dinh ha, dinh tai
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
ly nang » ky nang, ly hang, ly vang
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa

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