Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh dung » thanh dung, anh dung, hanh dong
cua thong » cua thuong, cua khong, cua tong
thong tan » thong than, thong tran, thong tin
ho chieu » theo chieu, hoc thieu, mot chieu
dung cua » dung luan, dung cho
tan tai » toan tai, tang tai, tuan tai
tai cao » thai cao, tao cao, tai sao

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 (doi chieu)) tinh - hanh dung cua thong thong tan tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) tinh - hanh dung cua thong thong tan tai cao.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) tinh - hanh dung cua thong thong tan tai cao*.