Perhaps you should try some spelling variations:
trinh thi » trinh tai, dinh thi, trinh tu
dung cong » dung trong
cong tinh » cong trinh, cong vinh, long tinh
ho chieu » theo chieu, hoc thieu, doi chieu
doc hieu » toc thieu, hoc thieu, hoc hien
trinh he » trinh han, trinh hoa, trinh ky
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) or (doc hieu)) xanh - hanh ((trinh he) or (trinh thi)) dung cong tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doc hieu)) xanh - hanh ((trinh he) OR (trinh thi)) dung cong tinh toan cao.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doc hieu)) xanh - hanh ((trinh he) or (trinh thi)) dung cong tinh toan cao*.