Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dieu cua » dieu tra
dien cuc » dien tu, vien cac, dien hoc
sach vu » sach va, sach tu, sach uu
va hanh » van hanh, va thanh, va danh
va tham » van tham, va thanh, va thuat
va cham » va chat
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
soc va » hoc va, loc va, doc va

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 vu nang xa hoi. hieu ((va cham) or (va tham)) soc va hanh ((dien cuc) OR (dieu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach vu nang xa hoi. hieu ((va cham) OR (va tham)) soc va hanh ((dien cuc) OR (dieu cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach vu nang xa hoi. hieu ((va cham) or (va tham)) soc va hanh ((dien cuc) OR (dieu cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach vu nang xa hoi. hieu ((va cham) or (va tham)) soc va hanh ((dien cuc) OR (dieu cua)) te*.