Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh trinh » canh tranh, hanh chinh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
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 trinh vat ((nhung cong) or (dung cong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh trinh vat ((nhung cong) OR (dung cong)) tac toan ban.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh trinh vat ((nhung cong) or (dung cong)) tac toan ban*.