Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh gia » danh gia, thanh gian, hinh giao
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
gia cua » gian cua, giau cua, gia cuc
duc van » duc va, duc tan, duc manh
sac ky » cac ky
nang o » nang co, nang ho, nang ro
ve cac » va cac
o hoi » co hoi, o hoc, o hai

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

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