Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
dua ban » dia ban, cua ban, qua ban
duc van » duc va, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu ve cac ((((duc tan) or (dua ban))) or (duc van)) thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ve cac ((((duc tan) OR (dua ban))) OR (duc van)) thanh ve cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ve cac ((((duc tan) or (dua ban))) or (duc van)) thanh ve cua tre*.