Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
va cham » va chat
va tham » van tham, va thuat
va danh » va dinh, va dan, va hanh
v nang » va nang, vu nang, van nang
sach v » sach va, sach y, sach 2
tu te » tu tu, tu le

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