Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
hao duc » dao duc, ho duc, cao duc
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach thu, xach tay
van hao » van dao, van ha, van bao

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) OR (sach ty)) nang xa hoi. hieu van hao duc ban thanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach ty)) nang xa hoi. hieu van hao duc ban thanh vi ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) OR (sach ty)) nang xa hoi. hieu van hao duc ban thanh vi ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) OR (sach ty)) nang xa hoi. hieu van hao duc ban thanh vi ((cua tre) or (cau tren))*.