Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tinh lai » tinh lao, tinh hai, minh lai
thu sach » thuat sach, thuoc sach, thu hoach
luc may » truc may, phuc may
cam luc » cam xuc, cau luc
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
lai va » loai va, mai va, dai va

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: ((tu sach) OR (thu sach)) tu nang xa hoi. ((hieu ve) OR (hieu qua)) cam luc may tinh lai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) tu nang xa hoi. ((hieu ve) or (hieu qua)) cam luc may tinh lai va triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) tu nang xa hoi. ((hieu ve) or (hieu qua)) cam luc may tinh lai va triet*.