Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
duc phan » dung phan, duc thang, duc phung
thanh va » thanh van, hanh va, thanh ha
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van bao » van ban, van dao
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
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: te sach ty nang x hoi. hieu van bao ((duc phan) or (duc tan)) thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu van bao ((duc phan) OR (duc tan)) thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu van bao ((duc phan) or (duc tan)) thanh va cua tre*.