Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
su sach » so sach, vu 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
hieu va » hieu qua
duc van » duc tan, duc manh, duc phan
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu va) OR (lieu va)) cao ((duc van) OR (duc va)) thanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu va) or (lieu va)) cao ((duc van) OR (duc va)) thanh van cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu va) or (lieu va)) cao ((duc van) OR (duc va)) thanh van cua tre*.