Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
te sach » toc sach
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
cam dua » ca dua, cay dua, chay dua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
me hoi » le hoi
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((me hoi) or (ma hoa)). hieu ve cam dua ((ban thanh) OR (ban hanh)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((me hoi) OR (ma hoa)). hieu ve cam dua ((ban thanh) OR (ban hanh)) san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((me hoi) or (ma hoa)). hieu ve cam dua ((ban thanh) OR (ban hanh)) san cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((me hoi) or (ma hoa)). hieu ve cam dua ((ban thanh) OR (ban hanh)) san cua tre*.