Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
hang tai » dung tai
vien cac » vien bach, vien dai, vien da
ly nang » ky nang, ly hang, ly vang
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
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: ((thu sach) or (te sach)) ly nang x hoi. hieu vien cac duc ban ((hang tai) or (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ly nang x hoi. hieu vien cac duc ban ((hang tai) OR (hang va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ly nang x hoi. hieu vien cac duc ban ((hang tai) or (hang va)) cua tre*.