Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van lanh » van anh, van hanh, van manh
lanh dai » lanh dao, lanh hai, lang dai
vu sach » vu bach, su sach, vu khach
vu khac » vu kham, vu khanh, bui khac
van tay » van tai, van tan, van tam
tay hoi » tay ho, tao hoi, tay thai
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
ky van » ly van, ty van, ky va

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 khac)) ky van tay hoi. lieu va cac duc van lanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khac)) ky van tay hoi. lieu va cac duc van lanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khac)) ky van tay hoi. lieu va cac duc van lanh dai cua triet*.