Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
thuoc lap » thuoc la, thuoc luan, thuoc phap
cua triet » cua viet, su triet, va triet
trinh va » trinh van, trinh vat, trinh ve
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
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 xa) or (nang x)) hoi. lieu va lam thuoc lap trinh va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. lieu va lam thuoc lap trinh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang x)) hoi. lieu va lam thuoc lap trinh va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. lieu va lam thuoc lap trinh va ((cua tre) OR (cua triet))*.