Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
tu sach » thu sach, su sach, te sach
cuc ban » cac ban, cuu ban, duc ban
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
anh de » anh d, anh ve, anh du
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: tu sach y nang o hoi. hieu cao chat ((cuc ban) OR (cua ban)) ((anh de) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu cao chat ((cuc ban) OR (cua ban)) ((anh de) OR (hanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hoi. hieu cao chat ((cuc ban) OR (cua ban)) ((anh de) or (hanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu cao chat ((cuc ban) OR (cua ban)) ((anh de) or (hanh de)) cua tre*.