Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
cam luc » cam xuc
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
dong y » dang y
di cua » dai cua, doi cua, de cua
y hoi » ky hoi, y hoc, o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (thuoc sach)) van dong y hoi. hieu va ((cam luc) or (cau luc)) va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) van dong y hoi. hieu va ((cam luc) OR (cau luc)) va danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) van dong y hoi. hieu va ((cam luc) or (cau luc)) va danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) van dong y hoi. hieu va ((cam luc) or (cau luc)) va danh di cua tre*.