Perhaps you should try some spelling variations:
thanh tieng » hanh tieng, thanh tien, thanh tung
huong trong » thuong trong, phuong trong, duong trong
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
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 ((chieu sach) or (hieu cach)) - thanh tieng viet huong trong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu cach)) - thanh tieng viet huong trong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu cach)) - thanh tieng viet huong trong san van ban*.