Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
khan thong » khap thong, khau thong, nhan thong
thuc hach » thuc hanh, chuc hach, thuc cach
hach toan » thanh toan, manh toan
toan phan » thanh phan, toan ban, hoa phan
thuc bach » truc bach, thuc cach, thuoc sach
hoc sach » hoc sinh, hoc anh
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, dai thuc, thi thuc
tri thuc » tri tue
bach kho » bach khoa, bac ho, benh kho
kho khan » khoa kham, khoa than
hoc cac » hoc cao
cac tri » cac tro, cac toi, cac thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( hoc sach tai thuc hach toan phan thong ) or ( hoc cac tri thuc bach kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( hoc sach tai thuc hach toan phan thong ) OR ( hoc cac tri thuc bach kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( hoc sach tai thuc hach toan phan thong ) or ( hoc cac tri thuc bach kho khan thong ))*.