Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cham tu » cam tu, chai tu, chay tu
pham tu » phan tu, pham thi, pham tai
danh va » doanh va, anh va, dan va
hanh va » hang va, hanh vi

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 ve ((cham tu) or (pham tu)) va ((danh va) OR (hanh va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve ((cham tu) OR (pham tu)) va ((danh va) OR (hanh va)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ve ((cham tu) or (pham tu)) va ((danh va) OR (hanh va)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve ((cham tu) or (pham tu)) va ((danh va) OR (hanh va)) su triet*.