Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
ho chieu » theo chieu, doi chieu, mot chieu
trinh va » trinh vat, trinh ve, trinh vi
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » 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 (hoc thieu)) xanh - hanh ((trinh va) or (trinh van)) dung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - hanh ((trinh va) OR (trinh van)) dung cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - hanh ((trinh va) or (trinh van)) dung cong san toan cau*.