Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
tan hanh » tan thanh, tang hanh, toan hanh
dua tren » dung tren
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va
cao duc » dao duc, cao suc, giao duc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. ((hieu ve) OR (hieu van)) cao duc tan hanh vi ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ma hoi. ((hieu ve) OR (hieu van)) cao duc tan hanh vi ((dua tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ma hoi. ((hieu ve) OR (hieu van)) cao duc tan hanh vi ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ma hoi. ((hieu ve) OR (hieu van)) cao duc tan hanh vi ((dua tren) or (cua triet))*.