Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
via cua » gia cua, gian cua, giau cua
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
soc va » hoc va, loc va, doc va
va dan » ca dan, va dao, va dau
va cua » va chua, ca cua, ma cua

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