Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang via » hang va, hang vi, hang giao
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
duc ban » duc van, dua ban, duc man
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cao » va cao, ve bao, ve cac
x hoi » xa hoi, o hoi, x ho

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 ((y nang) OR (v nang)) x hoi. hieu ve cao ((duc ban) or (duc tan)) hang via cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) x hoi. hieu ve cao ((duc ban) OR (duc tan)) hang via cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) x hoi. hieu ve cao ((duc ban) or (duc tan)) hang via cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) x hoi. hieu ve cao ((duc ban) or (duc tan)) hang via cua triet*.