Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
va doanh » vay doanh, va danh, hoa doanh
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
su tien » su kien, su hien, tu tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (te sach)) ky lang xa hoi. lieu va cham duc ((va doanh) OR (van doanh)) va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky lang xa hoi. lieu va cham duc ((va doanh) OR (van doanh)) va su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky lang xa hoi. lieu va cham duc ((va doanh) OR (van doanh)) va su tien".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky lang xa hoi. lieu va cham duc ((va doanh) OR (van doanh)) va su tien*.