Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dat » thanh san, thanh hai, thanh van
sach thu » sach thue, sach thieu, sach tham
cham duc » pham duc, cham soc, pham duy
dat cua » dai cua, day cua, mat cua
duc van » duc va, duc tan, duc manh
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, xach tay
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: te ((sach ty) OR (sach thu)) nang ((ma hoi) or (ma hoa)). hieu vu cham duc van thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) nang ((ma hoi) OR (ma hoa)). hieu vu cham duc van thanh dat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach thu)) nang ((ma hoi) or (ma hoa)). hieu vu cham duc van thanh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach thu)) nang ((ma hoi) or (ma hoa)). hieu vu cham duc van thanh dat cua tre*.