Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
cong tac » cong ty
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh ((trung tuan) or (tranh cua)) bang cong tac ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ((trung tuan) OR (tranh cua)) bang cong tac ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh ((trung tuan) or (tranh cua)) bang cong tac ((toan cao) or (toan ban))*.