Perhaps you should try some spelling variations:
van chat » cao chat
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, toan cau
nang xa » nang x, lang xa, nang ma
su viet » so viet
xuc va » duc va, tuc va, luc va

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 ky nang xa hoi. hieu ((van cau) or (van chat)) xuc va ((hanh dai) OR (hanh dao)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van cau) OR (van chat)) xuc va ((hanh dai) OR (hanh dao)) su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((van cau) or (van chat)) xuc va ((hanh dai) OR (hanh dao)) su viet*".