Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, thi nang
ban hanh » ban hang
cham cuu » cap cuu, chat cua
hanh di » hanh vi, hanh de, hang di
cuu ban » cuu van, cua ban, cuu san
va cham » va chat, va tham
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tru nang) OR (truc nano)) ((ma hoa) or (xa hoi)). hieu va cham cuu ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (truc nano)) ((ma hoa) OR (xa hoi)). hieu va cham cuu ban hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) OR (truc nano)) ((ma hoa) or (xa hoi)). hieu va cham cuu ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) OR (truc nano)) ((ma hoa) or (xa hoi)). hieu va cham cuu ban hanh di cua tre*.