Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thuoc sach » hoc sach, nuoc sach, thuoc sinh
phan thong » phan thuong, phan hong, phan tong
thuc cach » truoc cach, thuc hanh, tuc cac
khoa phan » hoa phan, khoa than, khoa phau
toc sach » hoc sach, doc sach, nuoc sach

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) or (((te sach) OR (toc sach)))) tri ((thuc cach) or (thuoc sach)) khoa phan thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (((te sach) OR (toc sach)))) tri ((thuc cach) OR (thuoc sach)) khoa phan thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (((te sach) OR (toc sach)))) tri ((thuc cach) or (thuoc sach)) khoa phan thong".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (((te sach) OR (toc sach)))) tri ((thuc cach) or (thuoc sach)) khoa phan thong*.