Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu van
hieu va » lieu va, hieu qua
do tuan » do xuan, do quang
cac do » cac don, cac doi, cac du
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky lang) OR (ky tang)) xa hoi. ((hieu ve) or (hieu va)) cac do tuan anh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) xa hoi. ((hieu ve) OR (hieu va)) cac do tuan anh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky tang)) xa hoi. ((hieu ve) or (hieu va)) cac do tuan anh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky tang)) xa hoi. ((hieu ve) or (hieu va)) cac do tuan anh va cua triet*.