Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
danh hai » dang hai, lanh hai, manh hai
cam thuc » am thuc, nam thuc, cam thu
nang ma » tang ma, sang ma, nang cao
sach ly » sach y, sach lo, sach hay
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai cau » hai chau, hai chu, hai hau
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach ty)) nang ma hoi. hieu van cam thuc va danh hai cau tren~.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach ty)) nang ma hoi. hieu van cam thuc va danh hai cau tren*.