Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
vien cac » vien bach, vien dai, vien da
dien cuc » dien tu, dieu cua, dien hoc
va danh » va dinh, va dan, va hanh
va cham » va chat
va tham » van tham, va thanh, va thuat
nang xa » nang x, lang xa, nang ma
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 van nang xa hoi. hieu ((va tham) or (va cham)) soc va danh ((dien cuc) OR (vien cac)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach van nang xa hoi. hieu ((va tham) OR (va cham)) soc va danh ((dien cuc) OR (vien cac)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach van nang xa hoi. hieu ((va tham) or (va cham)) soc va danh ((dien cuc) OR (vien cac)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach van nang xa hoi. hieu ((va tham) or (va cham)) soc va danh ((dien cuc) OR (vien cac)) tre*.