Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
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: ((hoc sach) or (thuoc sach)) _ lang xa hoi. hieu va cac du va hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (thuoc sach)) _ lang xa hoi. hieu va cac du va hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (thuoc sach)) _ lang xa hoi. hieu va cac du va hanh vi ((cua te) or (cua tu))*.