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