Perhaps you should try some spelling variations:
ban thanh » ban hanh
cham dua » chay dua, cham giua, pham duc
ban hang » ngan hang
san cua » sang cua, ban cua, dan cua
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 va) OR (hieu qua)) cham dua ((ban thanh) or (ban hang)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. ((hieu va) OR (hieu qua)) cham dua ((ban thanh) OR (ban hang)) san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. ((hieu va) OR (hieu qua)) cham dua ((ban thanh) or (ban hang)) san cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. ((hieu va) OR (hieu qua)) cham dua ((ban thanh) or (ban hang)) san cua tre*.