Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quan trong
theo chieu » theo tieu, ho chieu, theo chu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doc hieu)) xanh - hanh tinh quang trong cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) xanh - hanh tinh quang trong cong san toan tap.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) xanh - hanh tinh quang trong cong san toan tap*.