Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc van » duc va, duc tan, duc manh
va cua » va chua, via cua, ma cua
ca cua » co cua
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: tu sach ky nang x hoi. hieu va pham duc van hanh ((va cua) OR (ca cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu va pham duc van hanh ((va cua) OR (ca cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va pham duc van hanh ((va cua) OR (ca cua)) te*.