Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, dua tren
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
ve cac » va cac, vien 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) or (su sach)) ky nang x hoi. hieu ve cac duc ban hang vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu ve cac duc ban hang vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. hieu ve cac duc ban hang vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu ve cac duc ban hang vai ((cua tre) OR (cua triet))*.