Perhaps you should try some spelling variations:
trinh luan » trinh quan, trinh han, trinh toan
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
hoc hieu » hoc hien, doc hieu, hoc dieu
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (hoc thieu)) manh - hanh ((trinh luan) OR (trinh luat)) nhung cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc thieu)) manh - hanh ((trinh luan) OR (trinh luat)) nhung cong san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (hoc thieu)) manh - hanh ((trinh luan) OR (trinh luat)) nhung cong san toan tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc thieu)) manh - hanh ((trinh luan) OR (trinh luat)) nhung cong san toan tap*.