Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
cam tuc » cam xuc, cam tu, nam thuc
su sac » su sach, su xac
tuc va » thuc va, truc va, tuc xa
vi hoa » voi hoa, vi hoc, va hoa
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su cac)) ky tang mai hoi. ((hieu ve) or (hieu va)) cam tuc va danh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky tang mai hoi. ((hieu ve) OR (hieu va)) cam tuc va danh vi hoa viet.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su cac)) ky tang mai hoi. ((hieu ve) or (hieu va)) cam tuc va danh vi hoa viet*.