Perhaps you should try some spelling variations:
khanh vi » hanh vi, khanh v, nhanh vi
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hoi dan » hoa dan, hoc dan, thoi dai
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
xang xa » lang xa, mang xa, ang xa
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 ty xang xa hoi. ((hieu vu) or (hieu va)) cham ((hoi dan) OR (hoi dap)) khanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. ((hieu vu) OR (hieu va)) cham ((hoi dan) OR (hoi dap)) khanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang xa hoi. ((hieu vu) or (hieu va)) cham ((hoi dan) OR (hoi dap)) khanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. ((hieu vu) or (hieu va)) cham ((hoi dan) OR (hoi dap)) khanh vi cua tu*.