Perhaps you should try some spelling variations:
dan khai » dang khai, van khai, dang khoi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac luc » cau luc, cac nuoc, cac cuoc
dan hai » doan hai, dang hai, van hai
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu va ((cac luc) OR (coc luc)) va ((dan hai) OR (dan khai)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu va ((cac luc) OR (coc luc)) va ((dan hai) or (dan khai)) cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu va ((cac luc) OR (coc luc)) va ((dan hai) or (dan khai)) cua te*.