Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh dao » lanh dao, thanh dat, thanh dam
dang xay » dang van, van xay
bao luc » bao thuc
lang ha » long ha
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cao luc » cao duc, cao suc, cau luc
dao va » dao van, tao va, do va
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((lang ha) or (dang xay)) hoi. hieu va ((cao luc) OR (bao luc)) va hanh dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((lang ha) OR (dang xay)) hoi. hieu va ((cao luc) OR (bao luc)) va hanh dao va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((lang ha) or (dang xay)) hoi. hieu va ((cao luc) OR (bao luc)) va hanh dao va triet".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((lang ha) or (dang xay)) hoi. hieu va ((cao luc) OR (bao luc)) va hanh dao va triet*.