Perhaps you should try some spelling variations:
trinh thiet » trinh viet
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh thi » trinh tai, dinh thi, trinh tu
ho chieu » theo chieu, hoc thieu, doi chieu
cong van » cong vang, song van, cong tan
cong san » cong tac
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: ho chieu xanh - hanh ((trinh thiet) OR (trinh thi)) nhung ((cong van) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - hanh ((trinh thiet) OR (trinh thi)) nhung ((cong van) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - hanh ((trinh thiet) OR (trinh thi)) nhung ((cong van) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh ((trinh thiet) OR (trinh thi)) nhung ((cong van) or (cong san)) toan cao*.