Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
nano xa » nano va, nano bac, nano cau
tu nano » truc nano
cua tre » cua te, cuu tre, dua tren
co tuc » co thuc, co tu, do tuc
co toc » cao toc, co hoc, co doc

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nano xa hoi. hieu va ((co tuc) OR (co toc)) van hanh vai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nano xa hoi. hieu va ((co tuc) OR (co toc)) van hanh vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nano xa hoi. hieu va ((co tuc) OR (co toc)) van hanh vai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nano xa hoi. hieu va ((co tuc) OR (co toc)) van hanh vai ((cua tre) or (cua triet))*.