Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
hanh trang » canh tranh, hanh trinh, minh trang
qua trong » quan trong, qua trinh, qua song
cong san » cong tac
san toan » van toan, dan toan, manh 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: hoc ((chieu sang) or (chiet tach)) - ((hanh trang) or (thanh trung)) qua trong cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - ((hanh trang) OR (thanh trung)) qua trong cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chiet tach)) - ((hanh trang) or (thanh trung)) qua trong cong san toan ban*.