Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
thanh vi » hanh vi, thanh va, thanh ve
lua truc » luan thuc, xuan truc, tu truc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
tac va » tac da, tac xa, tuc va
vi lua » vi luu

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 lang xa hoi. hieu qua cham ((tac va) or (duc va)) thanh vi lua truc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu qua cham ((tac va) OR (duc va)) thanh vi lua truc.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu qua cham ((tac va) or (duc va)) thanh vi lua truc*.