Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
cong khi » cong thai, khong khi, co khi
nha bang » nha hang, nha sang, nhan dang
bang khi » ban khi, dang khoi, dang khai
su sach » so sach, vu sach
su tao » su tai, su cao, su tam
su dao » so dao, su cao, su dai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((su tao) OR (su dao)) nganh cong khi đong luc ) OR ( su sach nha bang khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( ((su tao) or (su dao)) nganh cong khi đong luc ) or ( su sach nha bang khi đong luc ))*.