Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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 ty nang xa hoi. hieu vien bach ((tuc va) or (duc va)) thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu vien bach ((tuc va) OR (duc va)) thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu vien bach ((tuc va) or (duc va)) thanh va cua tre*.