Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac toc » cac toi, cac nuoc, cac thoi
va tuan » van tuan, va quan, va toan
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

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