Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
danh sai » dung sai, danh bat, danh dau
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
x hoi » xa hoi, o hoi, 5 hoi

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