Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham tuc » nham thuc, pham thuc, tham thuc
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
sang ma » tang ma, nang ma, sang tao
va cham » va chat, va tham
va hanh » va thanh, va danh, ban hanh
va dua » va du, va da, va dia

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((nang x) or (sang ma)) hoi. lieu va cham tuc ((va hanh) OR (van hanh)) va dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((nang x) OR (sang ma)) hoi. lieu va cham tuc ((va hanh) OR (van hanh)) va dua tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((nang x) or (sang ma)) hoi. lieu va cham tuc ((va hanh) OR (van hanh)) va dua tren*".