Perhaps you should try some spelling variations:
tao nano » tao nganh, cao nang, tao nhan
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
bac hoi » bac ho, bac hoc, sach hoi
tao cao » bao cao, toan cao
cuu tre » cau tren, cau treo
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: so sach ((tao nano) or (tao cao)) bac 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: so sach ((tao nano) OR (tao cao)) bac hoi. hieu va cam xuc van hanh va ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sach ((tao nano) or (tao cao)) bac hoi. hieu va cam xuc van hanh va ((cua tre) or (cuu tre))*.