Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dua tren » dung tren
tan hanh » tan thanh, tang hanh, toan hanh
su triet » su viet, su tien, ve triet
dao duc » giao duc, tao duoc
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
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 nang) OR (v nang)) ma 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 nang) OR (v nang)) ma hoi. hieu ve dao duc tan hanh vi ((dua tren) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) OR (v nang)) ma hoi. hieu ve dao duc tan hanh vi ((dua tren) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) OR (v nang)) ma hoi. hieu ve dao duc tan hanh vi ((dua tren) or (su triet))*.