Perhaps you should try some spelling variations:
khoan phap » khoan phai, khoa phau, han phap
phap phong » hai phong, phap phan
cach thuc » anh thuc, cac thu
sach tren » sach tien, sach tranh
khoa phan » hoa phan, khoa than, khoa phau
phan cong » thanh cong
thuc dan » thuc hanh, hoc dan, thuc vat
cac khoa » cac khoi, dac khoa, cao khoa
tu cach » tu cac
dan cac » dan cach, dang cac, dan ca
tu sach » thu sach, su sach, te sach
tren ve » tren xe, tren he, tren vi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach thuc dan cac khoan phap phong ) or ( tu sach tren ve cac khoa phan cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thuc dan cac khoan phap phong ) OR ( tu sach tren ve cac khoa phan cong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thuc dan cac khoan phap phong ) or ( tu sach tren ve cac khoa phan cong ))*.