Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, khoa phau
phau thong » phap thong, phan thong, phan thuong
khau thong » khau thuong, khap thong, khau tong
khoi phau » khoa phau, khoai chau, khai pha
sach truc » cach thuc, sach tren, sach thu
truc thuc » truc thuoc, thuc thuc, truc thuy
cac khoi » cac thoi, cach thoi, hoc khoi
thuc cac » thuc cach, phuc cac, thac cac
bai tuc » bai tu, bai thuoc, dai thuc
tuc cac » tu cac, tich cac
so sach » so sanh, bo sach, co sach
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te cac bai tuc cac khoi phau thong ) or ( so sach truc thuc cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te cac bai tuc cac khoi phau thong ) OR ( so sach truc thuc cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te cac bai tuc cac khoi phau thong ) or ( so sach truc thuc cac khoan khau thong ))*.