Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
nhung don » nhung van, nhung bo
dung cong » dung trong
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 chieu tinh - hanh tranh cua ((nhung don) or (dung cong)) dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu tinh - hanh tranh cua ((nhung don) OR (dung cong)) dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo chieu tinh - hanh tranh cua ((nhung don) or (dung cong)) dan ((toan cao) or (toan ban))*.