Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
pham duy » pham duc
tu sach » thu sach, su sach, te sach
duy ban » uy ban, duy van, duy can
hanh de » hanh ve, hanh kem
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
anh de » anh d, anh ve, anh du
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 y nang x hoi. hieu van pham duy ban ((anh de) or (hanh de)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van pham duy ban ((anh de) OR (hanh de)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van pham duy ban ((anh de) or (hanh de)) cuu tre*.