Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
via cua » gia cua, gian cua, giau cua
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
su van » tu van, vu van
va cua » va chua, ca cua, ma cua
so va » so van, so vat, su va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang x hoi. hieu ve nam ((so va) or (su van)) dan ((va cua) or (via cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ve nam ((so va) OR (su van)) dan ((va cua) OR (via cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ve nam ((so va) or (su van)) dan ((va cua) or (via cua)) tre*.