Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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

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