Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
phu thong » pho thong, phap thong, phan thong
sach tren » sach tien, sach tranh
khoa khau » khoa kham, khoa phau, khoa chau
khoa phu » khoa phau, khoa thu, hoa phu
tren thi » trien thi, tran thi, trieu thi
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach
thi cac » thi cuc, tai cac, thi tac

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 tham thuc hanh khoa phu thong ) or ( tu sach tren thi cac khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc hanh khoa phu thong ) OR ( tu sach tren thi cac khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc hanh khoa phu thong ) or ( tu sach tren thi cac khoa khau thong ))*.