Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
toan cao » toan ban, toan tap
su sach » so sach, vu sach
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
bac hoi » bac ho, bac hoc, sach hoi
tao cao » bao cao
va cam » va cham, va cac, va cao
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, ve cai

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 cao) OR (toan cao)) bac hoi. hieu ((ve cam) or (va cam)) duc ban thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tao cao) OR (toan cao)) bac hoi. hieu ((ve cam) OR (va cam)) duc ban thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tao cao) OR (toan cao)) bac hoi. hieu ((ve cam) or (va cam)) duc ban thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((tao cao) OR (toan cao)) bac hoi. hieu ((ve cam) or (va cam)) duc ban thanh va cua tre*.