Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tan hanh » tan thanh, tang hanh, toan hanh
dua tren » dung tren
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
ve dao » va dao, ve bao, te dao

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 dao) OR (de 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 ma hoi. hieu ((ve dao) OR (de 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 ma hoi. hieu ((ve dao) OR (de dao)) duc tan hanh vi ((dua tren) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ma hoi. hieu ((ve dao) OR (de dao)) duc tan hanh vi ((dua tren) or (su triet))*.