Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
thang phap » thanh phan, thanh pham, chong phap
phap chong » phap phong, phap cong, pham hong
sach thue » sach thu, sach thieu, sach tham
thue thuc » thuc thuc, thue thu, thu thuc
bac thang » bac thanh, bao thang, ban hang
hanh kho » hanh khu, hang khoa, hanh theo
kho khan » khoa kham, khoa than
thuc bac » thuc ban, thuc lac, thuoc ban
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach

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 thue thuc hanh kho khan thong ) or ( tu sach thue thuc bac thang phap chong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thue thuc hanh kho khan thong ) OR ( tu sach thue thuc bac thang phap chong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thue thuc hanh kho khan thong ) or ( tu sach thue thuc bac thang phap chong ))*.