Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tu » cua tuc, cua su, cua cu
du va » dau va, tu va, su va

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)) _ lang xa hoi. hieu va cac du va hanh di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) _ lang xa hoi. hieu va cac du va hanh di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) _ lang xa hoi. hieu va cac du va hanh di ((cua te) or (cua tu))*.