Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
qua cau » quan cau, qua cac, qua ca
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
luc va » duc va, tuc va
loc va » hoc va
vi va » vi van, vai va, vu 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 ky ((nang xa) OR (lang xa)) hoi. hieu qua cau ((luc va) or (loc va)) thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu qua cau ((luc va) OR (loc va)) thanh vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (lang xa)) hoi. hieu qua cau ((luc va) or (loc va)) thanh vi va triet*".