Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
dien cua » dieu cua, dien cuc, dien cu
tien cua » trien cua, tiep cua, khien cua
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((cao hoi) or (cao hoc)). hieu van nam thuc va tinh ((dien cua) or (tien cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((cao hoi) OR (cao hoc)). hieu van nam thuc va tinh ((dien cua) OR (tien cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((cao hoi) or (cao hoc)). hieu van nam thuc va tinh ((dien cua) or (tien cua)) triet*.