Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
trinh xay » trinh ky
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
tran xay » tra xay, tran day, tran xuan
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan ta » chan tha, nhan tai, nhan tao

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 (ho chieu)) sach - hanh ((tran xay) OR (trinh xay)) dung cong dan chan ta~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sach - hanh ((tran xay) OR (trinh xay)) dung cong dan chan ta.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) sach - hanh ((tran xay) OR (trinh xay)) dung cong dan chan ta".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) sach - hanh ((tran xay) OR (trinh xay)) dung cong dan chan ta*.