Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sang » so sanh, so dang, so lang
sang ky » sang kyo, dang ky, tang ky
cao hoi » cau hoi, cao hoc, tao hoi
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc cac » xuc tac, tuc cac, xuc cam
doi cua » dai cua, hoi cua
co hoi » co hoc, co loi
di cua » dai cua, de cua, do 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 nang ((cao hoi) OR (co hoi)). hieu van cac xuc cac dan ((di cua) or (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ky nang ((cao hoi) OR (co hoi)). hieu van cac xuc cac dan ((di cua) OR (doi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ky nang ((cao hoi) OR (co hoi)). hieu van cac xuc cac dan ((di cua) or (doi cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sang ky nang ((cao hoi) OR (co hoi)). hieu van cac xuc cac dan ((di cua) or (doi cua)) te*.