Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung va
cau trung » cau truong, cac trung, cao trung
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
vu sach » su sach, vu khach
hieu ve » hieu van
hieu va » lieu va, hieu qua
ly van » le van, ly va, ly von
van xa » van xay, van ha, dan xa
vi cua » vai cua, di cua
bach » cach, bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu bach)) ly van xa hoi. ((hieu ve) or (hieu va)) cau trung van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) ly van xa hoi. ((hieu ve) OR (hieu va)) cau trung van hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu bach)) ly van xa hoi. ((hieu ve) or (hieu va)) cau trung van hanh vi cua triet*".