Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh tai » hang tai, han tai, hinh tai
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
cua tu » cua tuc, cua su, cua cu
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky tang xa hoi. hieu van cam ((tuc va) OR (tuc xa)) ((hanh tai) or (thanh tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky tang xa hoi. hieu van cam ((tuc va) OR (tuc xa)) ((hanh tai) OR (thanh tai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky tang xa hoi. hieu van cam ((tuc va) OR (tuc xa)) ((hanh tai) or (thanh tai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang xa hoi. hieu van cam ((tuc va) OR (tuc xa)) ((hanh tai) or (thanh tai)) cua tu*.