Perhaps you should try some spelling variations:
te sach » toc sach
cam tuc » cam xuc, nam thuc, dam thuc
hanh di » hanh de, hang di, danh di
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nano xa » nano va, nano bac, nano cau
ty nano » tu nano, day nano, tao nano
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nano xa hoi. hieu va ((cam tuc) or (cam tu)) van ((hanh di) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nano xa hoi. hieu va ((cam tuc) OR (cam tu)) van ((hanh di) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nano xa hoi. hieu va ((cam tuc) or (cam tu)) van ((hanh di) or (hanh vi)) cua tre*.