Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
chat luc » chat xuc, chat lua, nhan luc
van hanh » van thanh, ban hanh, van anh
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tuan » quan, tran, luan

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

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