Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
thanh di » thanh doi, thanh de, thanh dinh
thanh do » thanh de, thanh pho, thanh hoa
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
thuc va » thuc vat, thuc dan, thuc day
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. ((thien van) OR (thi van)) nam thuc va ((thanh di) or (thanh do)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. ((thien van) OR (thi van)) nam thuc va ((thanh di) OR (thanh do)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. ((thien van) OR (thi van)) nam thuc va ((thanh di) or (thanh do)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. ((thien van) OR (thi van)) nam thuc va ((thanh di) or (thanh do)) cua triet*.