Perhaps you should try some spelling variations:
nhung vung » nhung dung, nhung huong, nhung tuong
hieu lang » chieu sang, hieu quang, nhieu tang
vung manh » hung manh, tung manh, vung lanh
manh toan » thanh toan, anh tuan, tinh toan
doi hieu » doi chieu, doc hieu, doi hien
trang va » hang va
tran van » luan van
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: doi hieu lang - hanh ((trang va) or (tran van)) nhung vung manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((trang va) OR (tran van)) nhung vung manh toan ban.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((trang va) or (tran van)) nhung vung manh toan ban*.