Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh day » thanh dat, thanh tay, thanh dam
chang xu » chang xue, thong xu, chang ha
te sach » toc sach
day cua » dai cua
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
cam cuc » cham cuu, pham cuc
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((chang xu) OR (chao xu)) hoi. hieu va ((cam cuc) OR (cam xuc)) ban thanh day cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((chang xu) OR (chao xu)) hoi. hieu va ((cam cuc) or (cam xuc)) ban thanh day cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((chang xu) OR (chao xu)) hoi. hieu va ((cam cuc) or (cam xuc)) ban thanh day cua te*.