Perhaps you should try some spelling variations:
chiet tach » chieu sach
tang luan » dung luan
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
anh tang » anh bang, anh dang, anh nang
cong ban » cong bang, cong san, cong tan
than ban » thanh ban, toan ban, than man
ha tinh » va tinh, may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chiet tach) or (ha tinh)) - anh tang luan nang cong ban ((than ban) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chiet tach) OR (ha tinh)) - anh tang luan nang cong ban ((than ban) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: theo ((chiet tach) or (ha tinh)) - anh tang luan nang cong ban ((than ban) or (van ban))*.