Perhaps you should try some spelling variations:
thu san » thuy san, thu ban, phu san
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky nang x hoi. hieu va ((cac tuc) OR (cac tac)) va hanh ((vi cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang x hoi. hieu va ((cac tuc) OR (cac tac)) va hanh ((vi cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky nang x hoi. hieu va ((cac tuc) OR (cac tac)) va hanh ((vi cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu san ky nang x hoi. hieu va ((cac tuc) OR (cac tac)) va hanh ((vi cua) or (dai cua)) tre*.