Perhaps you should try some spelling variations:
tao nano » tao nganh, cao nang, tao nhan
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
bac hoi » bac ho, bac hoc, sach hoi
tao cao » bao cao, toan cao
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: su sach ((tao nano) or (tao cao)) bac hoi. hieu va cam duc van hanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tao nano) OR (tao cao)) bac hoi. hieu va cam duc van hanh va ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ((tao nano) or (tao cao)) bac hoi. hieu va cam duc van hanh va ((cua tre) or (cuu tre))*.