Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
danh vai » danh sai, danh va, dang van
cua viet » ca viet, hoa viet, cua dieu
tu sach » thu sach, su sach, te sach
sach ha » sach nha, sach han, sach xa
ha nang » kha nang, hoa nang, da nang
nang xa » nang x, lang xa, nang ma

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 ha nang xa hoi. hieu qua cham duc va ((danh vai) OR (doanh van)) ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ha nang xa hoi. hieu qua cham duc va ((danh vai) OR (doanh van)) ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ha nang xa hoi. hieu qua cham duc va ((danh vai) OR (doanh van)) ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: tu sach ha nang xa hoi. hieu qua cham duc va ((danh vai) OR (doanh van)) ((cua viet) or (cua vat))*.