Perhaps you should try some spelling variations:
dau truc » cau truc, dai truc, doan truc
van hanh » van thanh, ban hanh, van ban
so sach » so sanh, bo sach, co 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
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
di cuu » di cau, di cua, dinh cuu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. lieu va dau truc ((van hanh) or (van anh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. lieu va dau truc ((van hanh) OR (van anh)) di cuu tre*.