Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
dang xay » dang van, van xay
cam tuc » cam xuc, cam tu, dam thuc
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
doi su » oi su, don su, voi su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly ((nang xa) or (dang xay)) hoi. hieu qua ((cam tuc) or (nam thuc)) ban thanh doi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang xa) OR (dang xay)) hoi. hieu qua ((cam tuc) OR (nam thuc)) ban thanh doi su triet.
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang xa) or (dang xay)) hoi. hieu qua ((cam tuc) or (nam thuc)) ban thanh doi su triet*.