Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hang tai » dung tai
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, duc man
y nang » ky nang, ly nang, v nang
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 vien cac ((duc ban) OR (dua ban)) ((hang tai) or (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu vien cac ((duc ban) OR (dua ban)) ((hang tai) OR (hang va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu vien cac ((duc ban) OR (dua ban)) ((hang tai) or (hang va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu vien cac ((duc ban) OR (dua ban)) ((hang tai) or (hang va)) cua tre*.