Perhaps you should try some spelling variations:
phan thuong » hang thuong, phan xuong
khan thong » khap thong, khau thong, nhan thong
sach tai » sach bai, sach tham, sach dao
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach thieu, sach tham
kho khan » khoa kham, khoa than
tai tue » tri tue, tai tu, tai tieu
tue anh » tu anh, tuyet anh, tuan anh
yen anh » yen thanh, quyen anh, huyen anh
anh kho » anh khoa, anh tho, anh cho
anh co » anh so, danh cho, nganh co

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 tai tue anh co phan thuong ) or ( toc sach thi yen anh kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tai tue anh co phan thuong ) OR ( toc sach thi yen anh kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tai tue anh co phan thuong ) or ( toc sach thi yen anh kho khan thong ))*.