Perhaps you should try some spelling variations:
huong trong » thuong trong, phuong trong, duong trong
hanh tieng » anh tieng, ban tieng, hanh trang
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)) - hanh tieng viet huong trong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh tieng viet huong trong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cach)) - hanh tieng viet huong trong san van ban*.