Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
cac tao » cau tao, cac tro, cac tac
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
sac ky » cac ky, sai ky

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

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