Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, dua tren
xuc van » duc van, luc van, vuc van
dau xuc » dau xac, dau xua, dau nuoc
tu sach » thu sach, su sach, te sach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
va dau » va dao
v nang » va nang, van nang, voi nang

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