Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam dua » ca dua, cay dua, cach dua
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

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 ma hoa. hieu va ((cam dua) or (chay dua)) ban thanh ((vai cua) OR (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoa. hieu va ((cam dua) OR (chay dua)) ban thanh ((vai cua) OR (hai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoa. hieu va ((cam dua) or (chay dua)) ban thanh ((vai cua) OR (hai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoa. hieu va ((cam dua) or (chay dua)) ban thanh ((vai cua) OR (hai cua)) te*.