Perhaps you should try some spelling variations:
tao nganh » tao nhan, cac nganh, da nganh
tao nano » cao nang, tao cao, tao nhan
van hanh » van thanh, ban hanh, van anh
co sach » bo sach, cuon sach, hoc sach
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
cuu tre » cau tren, cau treo
xuc van » duc van, luc van, vuc van
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: co sach ((tao nano) OR (tao nganh)) xa hoi. hieu va cam xuc van hanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((tao nano) OR (tao nganh)) xa hoi. hieu va cam xuc van hanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((tao nano) OR (tao nganh)) xa hoi. hieu va cam xuc van hanh va ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: co sach ((tao nano) OR (tao nganh)) xa hoi. hieu va cam xuc van hanh va ((cua tre) or (cuu tre))*.