Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
luan hoan » luan van
hoan cong » hoang cong, hoa cong, toan cong
hang ban » hang luan, hang va, hang tai
ban luan » bang luan, ban quan, bai luan
dang van » hoang van, hang va
dan van » doan van, dao van, tan 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 hien xanh - hang ban luan hoan cong ((dan van) or (dang van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hang ban luan hoan cong ((dan van) OR (dang van)) ban*.