Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc gia » quoc gia, luong gia, nuoc giai
thanh vi » hanh vi, thanh va, thanh ve
dua tren » dung tren
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
luc gia » duc gia, quoc gia, duc giao
va cao » va cac, va co, va 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 cao ((luc gia) OR (luoc gia)) thanh vi ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. lieu va cao ((luc gia) OR (luoc gia)) thanh vi ((dua tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. lieu va cao ((luc gia) OR (luoc gia)) thanh vi ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. lieu va cao ((luc gia) OR (luoc gia)) thanh vi ((dua tren) or (cua triet))*.