Perhaps you should try some spelling variations:
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
cao hoi » cau hoi, co hoi, cao hoc
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
tu cai » tu cac, tu can, tu bai
vi cuu » vinh cuu
vi luu » vi lua
tu sai » tu bai, tu san, tu lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sai) or (tu cai)) ky nang cao hoi. hieu va cam tuc va danh ((vi cuu) OR (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu cai)) ky nang cao hoi. hieu va cam tuc va danh ((vi cuu) OR (vi luu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) or (tu cai)) ky nang cao hoi. hieu va cam tuc va danh ((vi cuu) OR (vi luu)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu cai)) ky nang cao hoi. hieu va cam tuc va danh ((vi cuu) OR (vi luu)) tre*.