Perhaps you should try some spelling variations:
phan thuong » hang thuong, phan xuong
phap chong » phap phong, phap cong, pham hong
sach tren » sach tien, sach tranh
khoa phan » hoa phan, khoa than, khoa phau
cach thuc » anh thuc, cac thu
khoa phap » khoa phau, khoan phai, khong phap
tren vat » trien vat, tren dat, tren vai
tu sach » thu sach, su sach, te sach
li khoa » loi khoa, ly khoa, lo khoa
tu cach » tu cac
thuc ve » thuc va, thuc te, thuc viet
vat li » vat ly, vat lieu
ve da » ve dao, ve dat, ve dan

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 tren vat li khoa phan thuong ) or ( tu cach thuc ve da khoa phap chong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren vat li khoa phan thuong ) OR ( tu cach thuc ve da khoa phap chong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren vat li khoa phan thuong ) or ( tu cach thuc ve da khoa phap chong ))*.