Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
cam luc » cam xuc, cau luc
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san
de va » de van, te va, ke va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang xa hoi. ((hieu va) OR (hieu qua)) cam luc ((va hanh) or (va thanh)) de va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. ((hieu va) OR (hieu qua)) cam luc ((va hanh) OR (va thanh)) de va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. ((hieu va) OR (hieu qua)) cam luc ((va hanh) or (va thanh)) de va trien".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. ((hieu va) OR (hieu qua)) cam luc ((va hanh) or (va thanh)) de va trien*.