Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sac » thu sach, thu san, thu xac
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
cac dat » cai dat, cac dai, cac dac
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang ((cao hoi) OR (cao hoc)). hieu van ((cac dat) or (cac dan)) va tinh va cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((cao hoi) OR (cao hoc)). hieu van ((cac dat) OR (cac dan)) va tinh va cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((cao hoi) OR (cao hoc)). hieu van ((cac dat) or (cac dan)) va tinh va cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((cao hoi) OR (cao hoc)). hieu van ((cac dat) or (cac dan)) va tinh va cua vat*.