Perhaps you should try some spelling variations:
dua tren » dung tren
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cao suc » cao su, cao duc
ca viet » va viet, co viet, hoa viet
cao luc » bao luc, cao duc, cau luc
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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