Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
qua cham » qua cac, va cham, qua cua
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
qua hai » qua hoat
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va dan » ca dan, va dao, va dau
de cua » le cua, te cua, dieu cua

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 dang xa hoi. hieu ((qua cham) OR (qua hai)) xuc ((ban thanh) or (va dan)) de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu ((qua cham) OR (qua hai)) xuc ((ban thanh) OR (va dan)) de cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu ((qua cham) OR (qua hai)) xuc ((ban thanh) or (va dan)) de cua viet*".