Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van ban
tru nang » tra nang, tri nang, truc nano
dao tuc » dao duc
van anh » van thanh, tuan anh, van minh
te sach » toc sach
hieu va » lieu va, hieu qua
tu nang » tu nong, tu nano, tu lang
dai ve » dap ve, dau ve, dai va
va dao » ca dao

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