Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam
tinh va » tich va, trinh van, tinh gia

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