Perhaps you should try some spelling variations:
tang dai » tang tai, tang dan, lang dai
van hanh » van thanh, ban hanh, van anh
ky tang » ky nang, ky dang, kho tang
dai moi » doi moi, dai hoi
hieu su » hieu sau, tieu su, hieu so
can xuc » cam xuc, chat xuc, can xung
va hanh » va thanh, va danh, ban hanh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
su can » su van, su cao, tu can
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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