Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dat » thanh san, thanh hai, thanh van
thong xu » thong tu, thong su, trong xu
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ban duc » ban duoc, van duc, ban dac
duc ban » duc tan, duc van, dua ban
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, chang xu

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 ((hang x) or (thong xu)) hoi. hieu van ban duc ban thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((hang x) OR (thong xu)) hoi. hieu van ban duc ban thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((hang x) or (thong xu)) hoi. hieu van ban duc ban thanh dat cua tre*.