Perhaps you should try some spelling variations:
tin mang » tin nang, ninh mang, tien manh
van hanh » van thanh, ban hanh, van anh
hieu cua » hieu qua, dieu cua, bieu cua
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
ty mang » ty xang, tri mang, cay mang
vi cua » vai cua, di cua
cua te » cua tu

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 ((((ty mang) OR (ty hang))) OR (tin mang)) xa hoi. hieu cua cac tuc van hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((ty mang) OR (ty hang))) or (tin mang)) xa hoi. hieu cua cac tuc van hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ((((ty mang) OR (ty hang))) or (tin mang)) xa hoi. hieu cua cac tuc van hanh vi cua te*.