Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
trinh thuc » trinh tu, trinh thi
sach khong » sach thuong, sach song, bach khang
khong phap » chong phap, khong phai, phuong phap
phap thong » phap phong, phap chong, pho thong
tren thuc » trien thuc, tron thuc, trong thuc

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 thuc) OR (trinh thuc))) or (trung quoc)) sach khong phap thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((((tren thuc) OR (trinh thuc))) OR (trung quoc)) sach khong phap thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((((tren thuc) OR (trinh thuc))) or (trung quoc)) sach khong phap thong".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((((tren thuc) OR (trinh thuc))) or (trung quoc)) sach khong phap thong*.