Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
doc sach » hoc sach, toc sach, nuoc sach
kho tang » cao tang
hanh tai » hang tai, han tai, hinh tai
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
ky tang » ky nang, ky dang, ky trong
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa
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: doc sach ((ky tang) OR (kho tang)) ma hoi. hieu van cam tuc va ((hanh tai) or (thanh tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ky tang) OR (kho tang)) ma hoi. hieu van cam tuc va ((hanh tai) OR (thanh tai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ky tang) OR (kho tang)) ma hoi. hieu van cam tuc va ((hanh tai) or (thanh tai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: doc sach ((ky tang) OR (kho tang)) ma hoi. hieu van cam tuc va ((hanh tai) or (thanh tai)) cua tu*.