Perhaps you should try some spelling variations:
so nganh » so ngan, hoc nganh, moi nganh
nganh ky » nganh y, nganh xay, hanh ky
vinh cuu » dinh cuu, sinh cua, dinh cu
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
cuu tre » cua tre, cau tren, cau treo
van hac » van hoc, van ha, van hai
van cac » van cau, van bac, dan cac
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so nganh ky nang ma hoi. hieu ((van cac) or (van hac)) du ((van hanh) or (va hanh)) vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so nganh ky nang ma hoi. hieu ((van cac) OR (van hac)) du ((van hanh) OR (va hanh)) vinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: so nganh ky nang ma hoi. hieu ((van cac) or (van hac)) du ((van hanh) or (va hanh)) vinh cuu tre*.