Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh ve, nhanh vi
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
su viet » so viet
ve cac » va cac, vien cac
tac xa » tuc xa, tac da
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu ve cac tac xa ((thanh vi) OR (thanh va)) su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ve cac tac xa ((thanh vi) OR (thanh va)) su viet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ve cac tac xa ((thanh vi) OR (thanh va)) su viet*.