Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van cau » van hau, van chat, toan cau
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
ty nang » ky nang, ty xang, ty hang
sai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
van dau » van dao, phan dau
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 ty nang x hoi. thien ((van cau) OR (van dau)) truc va danh ((sai cua) or (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. thien ((van cau) OR (van dau)) truc va danh ((sai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. thien ((van cau) OR (van dau)) truc va danh ((sai cua) or (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. thien ((van cau) OR (van dau)) truc va danh ((sai cua) or (hai cua)) triet*.