Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ky dang » ky danh
dai hoi » dai hoc, dai hai, dai moi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
soc van » hoc van, oc van, sac van
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
tu can » tu ban, tu cac, thu canh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ((ky dang) or (ky nang)) dai hoi. hieu vu cham soc van hanh ((vai cua) OR (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ((ky dang) OR (ky nang)) dai hoi. hieu vu cham soc van hanh ((vai cua) OR (hai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ((ky dang) or (ky nang)) dai hoi. hieu vu cham soc van hanh ((vai cua) OR (hai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu can ((ky dang) or (ky nang)) dai hoi. hieu vu cham soc van hanh ((vai cua) OR (hai cua)) te*.