Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
vuong quan » cuong quan, luong quang, thong quan
luong quan » thong quan, duong qua
hieu cach » hieu cac, chieu sach, hieu ca
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (hieu cach)) - hanh tang luan nang cong ((vuong quan) or (luong quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh tang luan nang cong ((vuong quan) OR (luong quan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - hanh tang luan nang cong ((vuong quan) or (luong quan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - hanh tang luan nang cong ((vuong quan) or (luong quan)) cau*.