Perhaps you should try some spelling variations:
nhung lang » nhung van, nhanh lang, nhung cong
hanh trinh » canh tranh, hanh chinh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
trinh ve » trinh he, trinh va, trinh vi
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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 ve ((nhung lang) or (hang cong)) luong ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh trinh ve ((nhung lang) OR (hang cong)) luong ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh trinh ve ((nhung lang) or (hang cong)) luong ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh trinh ve ((nhung lang) or (hang cong)) luong ((toan cau) OR (toan cao))*.