Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
quoc ban » quoc bao, quoc lan, quoc quan
hang vi » hang va, hanh vi, hang di
duc van » duc va, duc tan, duc manh
tu cach » tu cac
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky lang xa hoi. hieu ve cam ((quoc ban) or (duc van)) hang vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky lang xa hoi. hieu ve cam ((quoc ban) OR (duc van)) hang vi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky lang xa hoi. hieu ve cam ((quoc ban) or (duc van)) hang vi cua triet*.