Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sang mai » sang ma, sang tai, lang mai
tan hanh » tan thanh, tang hanh, toan hanh
dua tren » dung tren
su triet » su viet, su tien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
dao duc » giao duc, tao duoc
y sang » _ sang, duy sang
ve dao » de dao, va dao, ve bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y sang mai hoi. hieu ve dao duc tan hanh vi ((dua tren) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y sang mai hoi. hieu ve dao duc tan hanh vi ((dua tren) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thuat sach y sang mai hoi. hieu ve dao duc tan hanh vi ((dua tren) or (su triet))*.