Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
va hanh » va thanh, va danh, dao hanh
ve cau » ke cau, va cau, ve cac
vi cau » va cau, di cau, viet 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 ve cau luc ((((va hanh) or (ban hanh))) or (van hanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ve cau luc ((((va hanh) OR (ban hanh))) OR (van hanh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ve cau luc ((((va hanh) or (ban hanh))) or (van hanh)) vi cau tren*.