Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong
manh trung » manh tung, thanh trung, manh hung
hanh trinh » canh tranh, hanh chinh
cong ngang » cong nhan, cong quang, cong lang
hien sang » hien trang, chieu sang, thien bang
dung cong » dung trong
ngang van » ngan van, nang van, hoang van
cua dung » cua dang, cua dong, qua dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sang) OR (khien bang)) - ((manh trung) or (hanh trinh)) cua dung cong ngang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (khien bang)) - ((manh trung) OR (hanh trinh)) cua dung cong ngang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (khien bang)) - ((manh trung) or (hanh trinh)) cua dung cong ngang van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (khien bang)) - ((manh trung) or (hanh trinh)) cua dung cong ngang van ban*.