Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dao khang » dao khong, tao khang, tao khoang
trinh han » trinh quan
tinh hai » tinh thai, tinh chat, thanh hai
hieu van » hieu va, thien van, hieu ve
sach dao » lanh dao
su sach » so sach, vu sach
khang a » chang ha, khan gia, khang cu
du ban » dua ban, duc ban, du bao
a hoi » xa hoi, va hoi, o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach dao khang a hoi. ((lieu va) or (hieu van)) cac du ban ((tinh hai) OR (trinh han)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dao khang a hoi. ((lieu va) OR (hieu van)) cac du ban ((tinh hai) OR (trinh han)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach dao khang a hoi. ((lieu va) or (hieu van)) cac du ban ((tinh hai) OR (trinh han)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach dao khang a hoi. ((lieu va) or (hieu van)) cac du ban ((tinh hai) OR (trinh han)) cua triet*.