Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
trinh quan » tinh quang, trinh luat, trinh han
hanh dung » thanh dung, anh dung, manh dung
hanh dong » anh dong, ha dong
quan ban » quang ban, qua ban, quan van

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

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