Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
dan cua » dan ca, ban cua, dai cua
cac dia » cac di, cac giai, trac dia
cam dia » cam gia, pham dia
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tu nang » tru nang, tu nong, tu nano
ma hoi » mai hoi, xa hoi, me hoi

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