Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
toc sach » hoc sach, doc sach, thuoc sach
nang hoc » nang doc, nang luc, dong hoc
hoc khoi » hoc khoa, hoc hoa, hoc noi
hieu van » hieu va, thien van, lieu va
va doanh » vay doanh, hoa doanh, voi doanh
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
van am » van nam, van lam, van dam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang hoc khoi. hieu van am thuc ((((va doanh) OR (van doanh))) or (va danh)) tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang hoc khoi. hieu van am thuc ((((va doanh) OR (van doanh))) OR (va danh)) tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang hoc khoi. hieu van am thuc ((((va doanh) OR (van doanh))) or (va danh)) tri cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang hoc khoi. hieu van am thuc ((((va doanh) OR (van doanh))) or (va danh)) tri cua te*.