Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
tu sach » thu sach, su sach, te sach
tinh va » tich va, trinh van, trinh vat
tinh vi » tinh voi, dinh vi, tich vi
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
ve cam » ve cham, ve cac, va cam

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 y dang xa hoi. hieu ve cam cuc ban ((((tinh vi) OR (tinh va))) or (trinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xa hoi. hieu ve cam cuc ban ((((tinh vi) OR (tinh va))) OR (trinh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y dang xa hoi. hieu ve cam cuc ban ((((tinh vi) OR (tinh va))) or (trinh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xa hoi. hieu ve cam cuc ban ((((tinh vi) OR (tinh va))) or (trinh vi)) cua tre*.