Perhaps you should try some spelling variations:
dong thanh » truong thanh
hoc thieu » toc thieu, hoc hien
quang cua » quan cua, quang tuan, quang huy
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, doi chieu, mot chieu
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) tinh - nhanh quang cua thong ((dong thanh) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) tinh - nhanh quang cua thong ((dong thanh) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) tinh - nhanh quang cua thong ((dong thanh) or (cong san)) toan cao*.