Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
chuc ban » chuc can, chuc van, cuc ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
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 ky nang o hoi. hieu van pham chuc ban ((anh de) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu van pham chuc ban ((anh de) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu van pham chuc ban ((anh de) or (hanh de)) cua tre*.