Perhaps you should try some spelling variations:
thanh tieng » hanh tieng, thanh tien, thanh tung
huong trong » thuong trong, phuong trong, duong trong
thieu sach » chieu sach, thien hach, theo sach
hieu cach » hieu cac, chieu sach, hieu ca
trong san » trong cac, cong san, dong san
san van » tan van, luan van, tran 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)) - thanh tieng viet huong trong san van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - thanh tieng viet huong trong san van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - thanh tieng viet huong trong san van ban*.