Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
va dung » van dung, va duong, vat dung
sai cua » dai cua, hai cua, lai cua
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: ((tu sach) or (te sach)) ky nang xa hoi. hieu va ((cac du) or (cac dac)) va dung sai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. hieu va ((cac du) OR (cac dac)) va dung sai cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang xa hoi. hieu va ((cac du) or (cac dac)) va dung sai cua te*.