Perhaps you should try some spelling variations:
trinh quan » trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
ho thiet » hoa thiet, so thiet, hoc thieu
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho thiet) or (hoc thiet)) tach - hanh ((trinh quan) OR (tinh quang)) nhung cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (hoc thiet)) tach - hanh ((trinh quan) OR (tinh quang)) nhung cong van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (hoc thiet)) tach - hanh ((trinh quan) OR (tinh quang)) nhung cong van toan ban".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (hoc thiet)) tach - hanh ((trinh quan) OR (tinh quang)) nhung cong van toan ban*.