Perhaps you should try some spelling variations:
chau tre » chay tren, chau tho, cho tre
hanh lai » hanh lam, hanh tai, thanh lap
thu sach » thuat sach, thuoc sach, thu hoach
thuoc va » thuoc ma, thuong va, thuoc tai
thuc va » thuc vat, thuc dan, thuc day
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
ve bach » ve cach, vu bach, vi bach
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) OR (thu sach)) y nang x hoi. hieu ve bach ((thuoc va) or (thuc va)) hanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang x hoi. hieu ve bach ((thuoc va) OR (thuc va)) hanh lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang x hoi. hieu ve bach ((thuoc va) or (thuc va)) hanh lai chau tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang x hoi. hieu ve bach ((thuoc va) or (thuc va)) hanh lai chau tre*.