Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
cam cuc » cam xuc, cham cuu, pham cuc
cua tre » cua te, cuu tre, dua tren
hanh de » hanh ve, hanh kem
cuc ban » cua ban, cac ban, cuu ban
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 ((tu nano) or (truc nano)) xa hoi. hieu va cam cuc ban hanh de ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nano) OR (truc nano)) xa hoi. hieu va cam cuc ban hanh de ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nano) or (truc nano)) xa hoi. hieu va cam cuc ban hanh de ((cua tre) or (cua triet))*.