Perhaps you should try some spelling variations:
tang dan » tang van, tung dan, tang luan
hanh lai » hanh lam, hanh tai, thanh lap
hieu vu » hieu va, hieu ve, hieu su
cao tuc » dao tuc, cao duc, cao suc
ky tang » ky nang, ky dang, kho tang
dan hoi » dan hoc, dai hoi, van hoi
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
tu sac » tu sach, tu cac, tu bac
vu cao » cu cao, va cao
tu san » thu san, tu ban, tu can
cua tu » cua tuc, cua su, cua cu

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: ((tu sac) OR (tu san)) ky tang dan hoi. hieu vu cao tuc va hanh lai ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu san)) ky tang dan hoi. hieu vu cao tuc va hanh lai ((cua te) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu san)) ky tang dan hoi. hieu vu cao tuc va hanh lai ((cua te) or (cua tu))*.