Perhaps you should try some spelling variations:
hanh dien » nhanh dien, hang dien, danh dien
toc sach » hoc sach, doc sach, thuoc sach
dien cuc » dien tu, dieu cua, vien cac
van nang » van quang, van ban, van dong
va hanh » van hanh, va thanh, va danh
va chat » van chat, cao chat, hoa chat
soc va » hoc va, loc va, doc va
v nang » va nang, vu nang, voi 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: toc sach ((v nang) or (van nang)) xa hoi. hieu ((va chat) OR (va phat)) soc va hanh dien cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (van nang)) xa hoi. hieu ((va chat) OR (va phat)) soc va hanh dien cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) or (van nang)) xa hoi. hieu ((va chat) OR (va phat)) soc va hanh dien cuc te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (van nang)) xa hoi. hieu ((va chat) OR (va phat)) soc va hanh dien cuc te*.