Perhaps you should try some spelling variations:
so sang » so sanh, so dang, so lang
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sang ((ky lang) or (ky nang)) xa hoi. hieu ve cac duc va hanh ((vi cua) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ((ky lang) OR (ky nang)) xa hoi. hieu ve cac duc va hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ((ky lang) or (ky nang)) xa hoi. hieu ve cac duc va hanh ((vi cua) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sang ((ky lang) or (ky nang)) xa hoi. hieu ve cac duc va hanh ((vi cua) OR (di cua)) tre*.