Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va
cat va » chat va, cat van, vat va
luc va » duc va, tuc 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 ty nang ma hoi. hieu qua cham ((luc va) or (loc va)) hanh ((cat va) OR (dat va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu qua cham ((luc va) OR (loc va)) hanh ((cat va) OR (dat va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu qua cham ((luc va) or (loc va)) hanh ((cat va) OR (dat va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu qua cham ((luc va) or (loc va)) hanh ((cat va) OR (dat va)) triet*.