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