Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
so sang » so sanh, so dang, so lang
su giao » so giao
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
sang ky » sang kyo, dang ky, tang ky
su giau » sau giao
va cua » va chua, via cua, ca cua
cua te » cua tu

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 nang xa hoi. ((hieu va) or (hieu qua)) co ((su giau) OR (su giao)) thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ky nang xa hoi. ((hieu va) OR (hieu qua)) co ((su giau) OR (su giao)) thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ky nang xa hoi. ((hieu va) or (hieu qua)) co ((su giau) OR (su giao)) thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: so sang ky nang xa hoi. ((hieu va) or (hieu qua)) co ((su giau) OR (su giao)) thanh va cua te*.