Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
van hanh » ban hanh, van anh, van ban
cau tren » cu tren, dau tren, ca tren
van cham » van chat, van tham, van pham
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
vi cau » va cau, ve cau, di cau
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. hieu ((van cham) OR (va cham)) xuc ((van hanh) or (van thanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((van cham) OR (va cham)) xuc ((van hanh) OR (van thanh)) vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((van cham) OR (va cham)) xuc ((van hanh) or (van thanh)) vi cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((van cham) OR (va cham)) xuc ((van hanh) or (van thanh)) vi cau tren*.