Perhaps you should try some spelling variations:
nghien nang » nguyen nang, nghiep bang, nghiep nong
hoc nghien » hoc hien
trinh cua » tinh cua, trinh quan, trinh luan
dung cong » dung trong
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan cao » toan cao, tao cao, tay cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nghien nang - hanh ((trinh cua) or (trinh luat)) dung cong van tan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nghien nang - hanh ((trinh cua) OR (trinh luat)) dung cong van tan cao.
• Adding a wildcard symbol may retrieve word variants: hoc nghien nang - hanh ((trinh cua) or (trinh luat)) dung cong van tan cao*.