Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
duc tre » duoc tren, duc tien
hac tuc » thac toc, thai tuc
cua tre » cua te, cuu tre, cua triet
va nang » van nang, da nang, cam nang
van hac » van hoc, van ha, van hai
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang
ky danh » ky anh
tuc va » thuc va, truc va, tuc xa
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky danh) OR (ky dang)) mai hoi. hieu van hac tuc va nang tai ((cua tre) or (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky danh) OR (ky dang)) mai hoi. hieu van hac tuc va nang tai ((cua tre) OR (duc tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky danh) OR (ky dang)) mai hoi. hieu van hac tuc va nang tai ((cua tre) or (duc tre))*".