Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh sua » hinh su, hanh va, hanh tu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
sua cua » sua chua, qua cua, lua cua
lo van » le van, so van, do van

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