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
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa khau » khoa kham, khoa phau, khoa chau
hanh khoa » hang khoa, anh khoa, hanh hoa
phu thong » pho thong, phap thong, phan thong
lenh dao » lanh dao, benh dai, minh dao
dao thuc » dan thuc, dao tuc, do thuc
khoa phu » khoa phau, khoa thu, hoa phu
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 tham thuc bach khoa khau thong ) or ( tu lenh dao thuc hanh khoa phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc bach khoa khau thong ) OR ( tu lenh dao thuc hanh khoa phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc bach khoa khau thong ) or ( tu lenh dao thuc hanh khoa phu thong ))*.