Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
ban thanh » ban hang
sieu van » hieu van, su van, lieu va
van tham » van thanh, van tuan, van chat
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
de cua » le cua, te cua, dieu cua
cua tu » cua tuc, cua su, cua cu

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 ky tang xa hoi. sieu van tham thuc ((ban thanh) or (ban hanh)) de cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky tang xa hoi. sieu van tham thuc ((ban thanh) OR (ban hanh)) de cua tu.
• Adding a wildcard symbol may retrieve word variants: so sach ky tang xa hoi. sieu van tham thuc ((ban thanh) or (ban hanh)) de cua tu*.