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
ho chieu » theo chieu, hoc thieu, mot chieu
dung cua » dung luan, dung cho
tan thai » tay thai, ban thai, van thai
tan tai » toan tai, tang tai, tuan tai

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 thai) OR (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 thai) OR (tan tai)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) tinh - hanh dung cua thong thong ((tan thai) OR (tan tai)) cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) tinh - hanh dung cua thong thong ((tan thai) OR (tan tai)) cao*.