Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
lao dong » ha dong, van dong
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
toc lao » toc dao, hoc lao, toc cao
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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

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