Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van thai » van thoai, van tai, van hai
va thai » va tai, va tham, va thi
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va hanh, dia danh
su sach » so sach, vu sach
va dan » ca dan, va dao, va dau
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: su sach ky nang x hoi. hieu ((va thai) or (van thai)) tuc ((va danh) OR (va dan)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((va thai) OR (van thai)) tuc ((va danh) OR (va dan)) vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((va thai) or (van thai)) tuc ((va danh) OR (va dan)) vi cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((va thai) or (van thai)) tuc ((va danh) OR (va dan)) vi cau tren*.