Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
cay dua » chay dua, cay lua, ca dua
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
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

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

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