Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
dien cuc » dien tu, dieu cua, vien cac
doc sach » hoc sach, toc sach, nuoc sach
te sach » toc sach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
v nang » va nang, vu nang, van nang
cuc te » cua te, cuc thue, cuc tieu
x hoi » xa hoi, o hoi, x ho

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) or (doc sach)) v nang x hoi. hieu va cham hoc ((va danh) or (va hanh)) dien cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) v nang x hoi. hieu va cham hoc ((va danh) OR (va hanh)) dien cuc te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) v nang x hoi. hieu va cham hoc ((va danh) or (va hanh)) dien cuc te*.