Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
sach nham » sach nha, sach tham, sach han
bach khoa » anh khoa
khoa kham » kho khan, khoa than
thuc cach » thuoc sach, truoc cach, thuc hanh
tac trong » cay trong, hoc trong
thu sach » tu sach, thuat sach, thuoc sach
nham thu » nham thuc, nam thu, pham thu
thu bach » thi bach, thu hoach, truc bach
sach dai » sach dao, sach bai, sach dat
dai thuc » dan thuc, dai thu, dai thua
cach hoa » cach hoan, cach hoc, bach hoa
te sach » toc sach
hoa tac » hop tac, hoa cac, hoa tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach nham thu bach khoa kham thong ) or ( te sach dai thuc cach hoa tac trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach nham thu bach khoa kham thong ) OR ( te sach dai thuc cach hoa tac trong ))*.