Perhaps you should try some spelling variations:
doanh hieu » doanh sieu, doan dieu, dong hieu
bach khang » bac thang, bach dang
khang khoi » khang kho, khoang thoi, hang khoa
bach khuan » bach khoa, bach xuan
sach hieu » sach thieu, sach tien, manh hieu
hieu truc » hieu thuc, hieu tuc, hieu thuoc
khuan hoa » khuan khoa, chuan hoa, nhuan khoa
hoa thong » hoa trong, hoa khong, hoa thon
tu doanh » su doanh, te doanh, ty doanh
hieu luc » hieu luat, hieu qua
luc bach » luon bach, luc canh, vu bach
su sach » so sach, vu sach
khong » phong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu doanh hieu luc bach khang khoi khong ) or ( su sach hieu truc bach khuan hoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu doanh hieu luc bach khang khoi khong ) OR ( su sach hieu truc bach khuan hoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu doanh hieu luc bach khang khoi khong ) or ( su sach hieu truc bach khuan hoa thong ))*.