Perhaps you should try some spelling variations:
thai son » thai den, thai do, thai hoc
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va thai » van thai, va tai, va tham
son van » song van, san van, son va
cuu tre » cua tre, cau tren, cau treo
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. lieu va thai son van ((hanh vi) or (anh va)) ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. lieu va thai son van ((hanh vi) OR (anh va)) ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va thai son van ((hanh vi) or (anh va)) ((cuu tre) or (dua tren))*.