Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tren thuoc » trien thuoc, trung thuoc, tin thuoc
phap thong » phap phong, phap chong, pho thong
tren thuc » trien thuc, tron thuc, trinh thuc
sach khoa » bach khoa, sach nha, anh khoa
khoa phap » khoa phau, khoan phai, khong phap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((tren thuoc) OR (tren thuc)) sach khoa phap thong~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((tren thuoc) OR (tren thuc)) sach khoa phap thong".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((tren thuoc) OR (tren thuc)) sach khoa phap thong*.