Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
va truong » van truong, xa truong, va thuong
ho chieu » theo chieu, doi chieu, mot chieu
va trong » va thong, va tuong, va trung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 chinh ((va trong) OR (va truong)) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - hanh chinh ((va trong) OR (va truong)) cong tac toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - hanh chinh ((va trong) OR (va truong)) cong tac toan cao*".