Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
va trien » va truyen, va thiet, va tuyen
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va danh » va dinh, va hanh, dia danh
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
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: doc sach y nang xa hoi. hieu van cam xuc ((va danh) OR (va dan)) di ((cua te) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y nang xa hoi. hieu van cam xuc ((va danh) OR (va dan)) di ((cua te) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: doc sach y nang xa hoi. hieu van cam xuc ((va danh) OR (va dan)) di ((cua te) or (va trien))*.