Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
cham loc » cham soc, chon loc, hau loc
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tu sach » su sach, te sach, tu cach
2 dang » 2 danh, _ dang, b dang
cham o » cham soc
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) 2 dang cay phoi. hieu ve ((cham loc) or (cham o)) van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) 2 dang cay phoi. hieu ve ((cham loc) OR (cham o)) van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) 2 dang cay phoi. hieu ve ((cham loc) or (cham o)) van hanh va cua tre*.