Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
ly vang » ly hang, ly van, ly quang
hieu te » hieu ve, hien te, hieu he
te cua » tue cua, le cua, de cua
ly ang » ly hang, ly nang, ly anh
cua te » cua tu
ac va » tac va, bac va, mac va

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 ((ly ang) OR (ly vang)) xa hoi. hieu te cua ((ac va) or (truc va)) hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly ang) OR (ly vang)) xa hoi. hieu te cua ((ac va) OR (truc va)) hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly ang) OR (ly vang)) xa hoi. hieu te cua ((ac va) or (truc va)) hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly ang) OR (ly vang)) xa hoi. hieu te cua ((ac va) or (truc va)) hanh dai cua te*.