Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cau theo » cau thi, cau tao
tay tang » tay lang, tay trung, tay quang
danh vai » danh sai, danh va, dang van
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ty tang » ty xang, ty hang, ky tang
va cam » va cham, va cac, va cao

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 ((ty tang) or (tay tang)) xa hoi. hieu va cam duc va ((danh vai) or (doanh van)) cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty tang) OR (tay tang)) xa hoi. hieu va cam duc va ((danh vai) OR (doanh van)) cau theo.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty tang) or (tay tang)) xa hoi. hieu va cam duc va ((danh vai) or (doanh van)) cau theo*.