Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dao » lanh dao, thanh dat, thanh dam
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, dua tren
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
van cam » van nam, van lam, van cau

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