Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
quan cau » quang cao, toan cau, quan ha
truc va » thuc va, thuc vat, trung va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
qua ca » qua cac, qua cua, qua cai

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 lang xa hoi. hieu ((quan cau) OR (qua ca)) truc va hanh va ((ve triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ((quan cau) or (qua ca)) truc va hanh va ((ve triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ((quan cau) or (qua ca)) truc va hanh va ((ve triet) OR (su triet))*.