Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
phan duc » pham duc, phan tu, phan dau
su sach » so sach, vu sach
hai cuc » tai cuc, hai cua, thai cua
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cuc tre » duc tre, cua tre, cuu tre

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