Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
hanh lam » thanh lap, hanh kem, hanh va
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
lam cua » nam cua, lam chat
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sac ky)) nang xa hoi. ((hieu van) OR (hieu va)) tac tu va hanh lam cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sac ky)) nang xa hoi. ((hieu van) or (hieu va)) tac tu va hanh lam cua triet~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) OR (sac ky)) nang xa hoi. ((hieu van) or (hieu va)) tac tu va hanh lam cua triet*.