Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu cac » hieu luc, hieu van, vien cac
nhan luc » nang luc
sach ky » sac ky, sach y, sach ty
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
anh vi » anh va, anh ve, anh vu

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