Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
van chat » cao chat
sach ty » sach y, sach thu, xach tay
van cau » van dau, van hau, toan cau
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
su viet » so viet
luc va » duc va, tuc va, loc va
dai su » dai sua, dai so, dan su

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: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu ((van cau) OR (van chat)) luc va thanh dai su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang xa hoi. hieu ((van cau) or (van chat)) luc va thanh dai su viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu ((van cau) or (van chat)) luc va thanh dai su viet*.