Perhaps you should try some spelling variations:
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, dia danh
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, ban hanh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
cua te » cua tu

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 nang xa hoi. ((hieu va) or (lieu va)) cam luc ((va danh) OR (va hanh)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. ((hieu va) OR (lieu va)) cam luc ((va danh) OR (va hanh)) hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. ((hieu va) or (lieu va)) cam luc ((va danh) OR (va hanh)) hai cua te".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. ((hieu va) or (lieu va)) cam luc ((va danh) OR (va hanh)) hai cua te*.