Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang cai » nang cao, nang tai, nang cap
thai cua » than cua, tai cuc, tri cua
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
cai hoi » cau hoi, dai hoi, cai hoa
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach y nang cai hoi. ((hieu ve) OR (hieu va)) cam luc ((va hanh) or (va danh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach y nang cai hoi. ((hieu ve) OR (hieu va)) cam luc ((va hanh) OR (va danh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach y nang cai hoi. ((hieu ve) OR (hieu va)) cam luc ((va hanh) or (va danh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu khach y nang cai hoi. ((hieu ve) OR (hieu va)) cam luc ((va hanh) or (va danh)) thai cua tre*.