Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
dao luc » dao duc, dao tuc, bao luc
luc gia » luoc gia, duc gia, quoc gia
va dao » ca dao

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. lieu va dao luc gia thanh vi ((((dua tren) OR (dung tren))) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. lieu va dao luc gia thanh vi ((((dua tren) OR (dung tren))) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. lieu va dao luc gia thanh vi ((((dua tren) OR (dung tren))) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. lieu va dao luc gia thanh vi ((((dua tren) OR (dung tren))) or (cua viet))*.