Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chieu sang » chieu sach, chieu xanh, hieu lang
duong cong » dung cong, luong cong, duong trong
trang qua » trong qua, trong quan, trang tuan
qua duong » quan duong, qua dung, qua dong
hieu van » hieu va, thien van, lieu va
cong tap » cuong tap, cong tac, cong tan
tap doan » tap quan
doan cao » doanh cao, toan cao, doan cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu van)) - hanh trang qua duong cong tap doan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu van)) - hanh trang qua duong cong tap doan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu van)) - hanh trang qua duong cong tap doan cao*.