Perhaps you should try some spelling variations:
tang doi » hang doi, tang loi, tang di
ky tang » ky nang, ky dang, kho tang
doi moi » doi voi
hieu su » hieu sau, tieu su, hieu so
cua tuc » cua duc, cua tu, cua thuoc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
su cam » su nam, su cao, su can
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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 tang doi moi. hieu su cam ((xuc va) or (tuc va)) hanh vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang doi moi. hieu su cam ((xuc va) OR (tuc va)) hanh vi cua tuc.
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang doi moi. hieu su cam ((xuc va) or (tuc va)) hanh vi cua tuc*.