Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
tham soc » cham soc, tham nuoc, thai son
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
soc van » hoc van, oc van, sac van
va tham » van tham, va cham, va thanh
sy long » sy luong, quy long
ky long » ky cong, ky trong, khi long
tu san » thu san, tu ban, tu can

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 long) or (sy long)) ha noi. lieu va tham soc van hanh di ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky long) OR (sy long)) ha noi. lieu va tham soc van hanh di ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu san ((ky long) or (sy long)) ha noi. lieu va tham soc van hanh di ((cua triet) or (cua viet))*.