Perhaps you should try some spelling variations:
thuoc tai » nuoc tai, hoc tai, thuoc ma
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
ve bach » ve cach, vu bach, vi bach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
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 y nang x hoi. hieu ve bach ((thuoc tai) or (thuc va)) hanh ((hai cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ve bach ((thuoc tai) OR (thuc va)) hanh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ve bach ((thuoc tai) or (thuc va)) hanh ((hai cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ve bach ((thuoc tai) or (thuc va)) hanh ((hai cua) OR (hoi cua)) tre*.