Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoan khau » khoanh khac, khoa kham, khoa phau
phu thong » pho thong, phap thong, phan thong
hoach sat » hoach dat, hoach san, hoach sau
sach han » sach tham, sach danh, sach nang
han thuc » nhan thuc, phan thuc, dan thuc
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoi, dac khoa, cao khoa
khoa phu » khoa phau, khoa thu, hoa phu
sat thuc » am thuc, va thuc, dan thuc
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach han thuc cac khoa phu thong ) or ( thu hoach sat thuc cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach han thuc cac khoa phu thong ) OR ( thu hoach sat thuc cac khoan khau thong ))*.