Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
toc sac » toc sach, toc san, hoc sach
cua lao » cu lao, ca lao, cua dao
lao van » dao van, cao van, lo van
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
di cua » dai cua, doi cua, de cua

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

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