Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh va, hanh tai, hanh van
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sai ky » sac ky
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac lo van ((hanh vai) OR (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sai ky)) nang xa hoi. hieu ve cac lo van ((hanh vai) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac lo van ((hanh vai) OR (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac lo van ((hanh vai) OR (hanh vi)) cua triet*.