Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van tham » van thanh, van tuan, van chat
tan banh » tan binh, ban banh, tang binh
sach ky » sac ky, sach y, sach ty
va tham » va cham, va thanh, va thuat
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho
d cua » do cua, da cua, di 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 nang x hoi. hieu ((va tham) or (van tham)) duc tan banh ((d cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((va tham) OR (van tham)) duc tan banh ((d cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((va tham) or (van tham)) duc tan banh ((d cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((va tham) or (van tham)) duc tan banh ((d cua) OR (de cua)) tre*.