Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
duc van » duc tan, duc manh, duc phan
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

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