Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
lang dai » lang hai, lang mai, hoang dai
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 y ((lang dai) OR (lang chai)) han. hieu va cac thuc ((va hanh) or (va danh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((lang dai) OR (lang chai)) han. hieu va cac thuc ((va hanh) OR (va danh)) vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((lang dai) OR (lang chai)) han. hieu va cac thuc ((va hanh) or (va danh)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((lang dai) OR (lang chai)) han. hieu va cac thuc ((va hanh) or (va danh)) vi cuu tre*.