Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam quoc » lam duoc, nam quoc, lam thuoc
quoc ban » quoc bao, quoc lan, quoc quan
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, mang may
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, dua tren
va lam » van lam, va lap

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 ky ((nang ma) or (nang cao)) hoi. lieu va lam quoc ban hang di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (nang cao)) hoi. lieu va lam quoc ban hang di ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (nang cao)) hoi. lieu va lam quoc ban hang di ((cua tre) or (cua triet))*.