Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh dong » anh dong, ha dong
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
thong tan » thong than, thong tran, thong tin
ho chieu » theo chieu, hoc thieu, mot chieu
tan thai » tay thai, ban thai, tan tai
thai cao » tai cao, thoai cac, thuat cao

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 dong ((cua thong) OR (cua khong)) thong tan thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) tinh - hanh dong ((cua thong) OR (cua khong)) thong tan thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) tinh - hanh dong ((cua thong) OR (cua khong)) thong tan thai cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) tinh - hanh dong ((cua thong) OR (cua khong)) thong tan thai cao*.