Perhaps you should try some spelling variations:
bach phuong » bich phuong, thach phuong, bang phuong
khan thong » khap thong, khau thong, nhan thong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
phuong he » phuong te, phuong de, phuong ke
hanh kho » hanh khu, hang khoa, hanh theo
kho khan » khoa kham, khoa than
te sach » toc sach
tu bach » vu bach, tu cach, tu bac

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 tren thuc hanh kho khan thong ) or ( thu hoach su tu bach phuong he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tren thuc hanh kho khan thong ) OR ( thu hoach su tu bach phuong he thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tren thuc hanh kho khan thong ) or ( thu hoach su tu bach phuong he thong ))*.