Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
truc van » truc va, thuc van, truc ban
hoc sach » hoc sinh, hoc cac, hoc anh
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
ve cau » ke cau, va cau, ve cac
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nuoc sach) or (hoc sach)) ky nang o hoi. hieu ve cau truc van ((hanh dai) or (hanh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc sach) OR (hoc sach)) ky nang o hoi. hieu ve cau truc van ((hanh dai) OR (hanh dao)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((nuoc sach) or (hoc sach)) ky nang o hoi. hieu ve cau truc van ((hanh dai) or (hanh dao)) cua tre*.