Perhaps you should try some spelling variations:
thuc day » thuc dan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
sach ty » sach y, sach tu, sach thu
van dau » van dao, phan dau
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van dau ((thuc vat) OR (thuc day)) hanh ((hai cua) OR (hoi cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van dau ((thuc vat) or (thuc day)) hanh ((hai cua) OR (hoi cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van dau ((thuc vat) or (thuc day)) hanh ((hai cua) OR (hoi cua)) tre*.