Perhaps you should try some spelling variations:
hieu va » hieu qua
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
dai moi » doi moi, dai hoi
va hanh » van hanh, va thanh, va danh
chat xu » chat xuc, chao xu, chat huu
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
cua te » cua tu
xu va » xu van, tu va, su va

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) or (ky dang)) dai moi. ((hieu va) OR (lieu va)) chat xu va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky tang) OR (ky dang)) dai moi. ((hieu va) OR (lieu va)) chat xu va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky tang) or (ky dang)) dai moi. ((hieu va) OR (lieu va)) chat xu va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky tang) or (ky dang)) dai moi. ((hieu va) OR (lieu va)) chat xu va hanh vi cua te*.