Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
va triet » va thiet, va trien, ve triet
sach tu » sach thu, cach tu, sach ty
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
luc va » duc va, tuc va
loc va » hoc va
lai va » loai va, mai va, dai va

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