Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
thi cuu » thi cuc, thi huu, thi cu
cuu tre » cua tre, cau tren, cau treo
su sac » su sach, su xac
su cac » tu cac, su cao, su can
va cau » van cau, va cac, va dau

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

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