Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
hanh sinh » hanh tinh, hanh dinh, hinh sinh
dang cong » dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
sinh cua » manh cua, dinh cuu, sinh va
toan cao » toan tap
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: hoc hieu nganh - hanh sinh cua ((nhung cong) or (dang cong)) van ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - hanh sinh cua ((nhung cong) OR (dang cong)) van ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - hanh sinh cua ((nhung cong) or (dang cong)) van ((toan cao) or (toan ban))*.