Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
v nang » va nang, van nang, voi nang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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