Perhaps you should try some spelling variations:
su sach » so sach
cua tre » cua te, cua triet, dua tren
dung co » dung cho, dung cong, dung cua
va dung » van dung, va duong, vat dung
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky nang xa hoi. hieu va cac tuc va dung co ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. hieu va cac tuc va dung co ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang xa hoi. hieu va cac tuc va dung co ((cua tre) or (cuu tre))*.