Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van lanh » van hanh, van manh, van canh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
van anh » van thanh, tuan anh, van minh
ve cac » va cac, vien cac
hai su » hai vu, lai su, hai so

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 ky dang xay hoi. hieu ve cac duc ((van lanh) or (van anh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ve cac duc ((van lanh) OR (van anh)) hai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ve cac duc ((van lanh) or (van anh)) hai su triet*.