Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
hanh va » hang va
loc van » luoc van, hoc van, lo van
lam loc » lam duoc, lam ngoc
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty hang, ly nang
van lam » van nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) OR (ty xang)) xa hoi. hieu van lam loc van ((hanh va) or (hanh vi)) cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) xa hoi. hieu van lam loc van ((hanh va) OR (hanh vi)) cau triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) OR (ty xang)) xa hoi. hieu van lam loc van ((hanh va) or (hanh vi)) cau triet*".