Perhaps you should try some spelling variations:
van trieu » van tieu, van hieu, van tien
ban hanh » ban hang
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
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: te sach y nang ma hoi. hieu ve ((cam duc) or (pham duc)) ban hanh vi ((van trieu) OR (tan trieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu ve ((cam duc) OR (pham duc)) ban hanh vi ((van trieu) OR (tan trieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu ve ((cam duc) or (pham duc)) ban hanh vi ((van trieu) OR (tan trieu))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu ve ((cam duc) or (pham duc)) ban hanh vi ((van trieu) OR (tan trieu))*.