Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thieu sach » chieu sach, thien hach, theo sach
hieu cach » hieu cac, chieu sach, hieu ca
cong lang » cong vang, cong luong, cong quang
lang tuan » lang xuan, quang tuan, hoang tuan
tuan chau » tran chau, chuan chau, thanh chau
tran van » luan 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 ((thieu sach) OR (hieu cach)) - hanh ((tran van) or (hang va)) phuong cong lang tuan chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh ((tran van) OR (hang va)) phuong cong lang tuan chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - hanh ((tran van) or (hang va)) phuong cong lang tuan chau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - hanh ((tran van) or (hang va)) phuong cong lang tuan chau*.