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

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