Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, thi chieu
trinh quan » tinh quang, trinh luat, trinh han
cong ngang » cong nhan, cong quang, cong lang
ngang toan » nganh toan, dang toan, quang toan
trinh cua » tinh cua, trinh luat, trinh luan
dung cong » dung trong
theo chu » cho chu, chao chu, theo yeu
toan cao » toan ban, toan tap

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