Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cac dau » cac dan, cac du, cac dai
hanh va » hang va, hanh vi
hanh ve » hanh vi, hanh kem
dau gia » danh gia, cau giay, mau giao
su sach » so sach, vu sach
sach ki » sach kinh, sach bai, sach kem
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
ki nang » ky nang
hieu va » lieu va, hieu qua

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 ki nang xa hoi. ((hieu ve) OR (hieu va)) cac dau gia ((hanh ve) or (hanh va)) cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ki nang xa hoi. ((hieu ve) OR (hieu va)) cac dau gia ((hanh ve) OR (hanh va)) cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ki nang xa hoi. ((hieu ve) OR (hieu va)) cac dau gia ((hanh ve) or (hanh va)) cau triet".
• Adding a wildcard symbol may retrieve word variants: su sach ki nang xa hoi. ((hieu ve) OR (hieu va)) cac dau gia ((hanh ve) or (hanh va)) cau triet*.