Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
luc van » luoc van, luu van, duc van
di cua » dai cua, doi cua, de cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cau » va cau, ve cac, le cau
ke cau » ket 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 sac ky nang x hoi. hieu ((ve cau) OR (ke cau)) luc van hanh ((vai cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. hieu ((ve cau) OR (ke cau)) luc van hanh ((vai cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. hieu ((ve cau) OR (ke cau)) luc van hanh ((vai cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu ((ve cau) OR (ke cau)) luc van hanh ((vai cua) or (di cua)) tre*.