Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
qua hai » qua hoat
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
tuc va » thuc va, tuc xa, duc va

You may be able to get more results by adjusting your search query.

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