Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thuoc ma » hoc ma, duoc ma
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
sach ly » sach y, sach lo, sach ty
qua nam » quan nam, cua nam, quang nam
tang ma » mang may, tang van
ly tang » le tang, ly hang, ly vang
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: tu sach ly tang ma hoi. hieu qua nam ((thuoc ma) or (thuc va)) ((thanh van) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly tang ma hoi. hieu qua nam ((thuoc ma) OR (thuc va)) ((thanh van) OR (hanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly tang ma hoi. hieu qua nam ((thuoc ma) or (thuc va)) ((thanh van) or (hanh va)) cuu tre*.