Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hanh tai » hang tai, han tai, hinh tai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hac tuc » thac toc, thai tuc
van hac » van hoc, van ha, van hai
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
su sac » su sach, su cac, su xac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (lang xa)) hoi. hieu van hac tuc va ((hanh tai) OR (thanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) OR (lang xa)) hoi. hieu van hac tuc va ((hanh tai) or (thanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) OR (lang xa)) hoi. hieu van hac tuc va ((hanh tai) or (thanh tai)) cua tre*.