Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
cac co » cac cong
co van » cao van, vo van, so van
vi cua » di 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 y) or (sac ky)) nang x hoi. hieu ve cac co van hanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) nang x hoi. hieu ve cac co van hanh ((vi cua) OR (vai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) nang x hoi. hieu ve cac co van hanh ((vi cua) or (vai cua)) triet*.