Perhaps you should try some spelling variations:
sach tao » sach dao, sach bao, sach tai
tao nano » tao nganh, cao nang, tao cao
nano cau » nang cau, bang cau, nano va
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tao nano cau hoi. hieu qua ((cam duc) OR (cao duc)) van hanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tao nano cau hoi. hieu qua ((cam duc) OR (cao duc)) van hanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tao nano cau hoi. hieu qua ((cam duc) OR (cao duc)) van hanh va ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach tao nano cau hoi. hieu qua ((cam duc) OR (cao duc)) van hanh va ((cua tre) or (cuu tre))*.