Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
tang luan » dung luan
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
anh tang » anh bang, anh dang, anh nang
van tan » van tuan, van tai, van thanh

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

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