Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
nang cho » nang chon, ngang cho, nang cao
pham cuc » pham chuc, pham duc, pham cua
tu sach » thu sach, su sach, te sach
cam cuc » cam xuc, cham cuu
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cho hoc » co hoc, khoa hoc

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 ky nang cho hoc. ((hieu va) or (lieu va)) ((cam cuc) OR (pham cuc)) ban doanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cho hoc. ((hieu va) OR (lieu va)) ((cam cuc) OR (pham cuc)) ban doanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cho hoc. ((hieu va) or (lieu va)) ((cam cuc) OR (pham cuc)) ban doanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cho hoc. ((hieu va) or (lieu va)) ((cam cuc) OR (pham cuc)) ban doanh tai cuu tre*.