Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac toc » cac toi, cac nuoc, cac thoi
su sai » su tai, su hai, su dai
sai ky » sac ky
toc va » hoc va, toc ta, tuc va
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

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