Perhaps you should try some spelling variations:
chieu khong » chien chong, chu khong, chieu duong
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) or (chieu khong)) - hanh trinh cua dung cong tan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu khong)) - hanh trinh cua dung cong tan than ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu khong)) - hanh trinh cua dung cong tan than ban*.