Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh noi » ha noi, hanh vi, nang noi
noi cua » hoi cua, doi cua, moi cua
va hanh » van hanh, va thanh, va danh
dao loc » dao cuoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
va lang » va nang, hoa lang
o lang » hoa lang, hoi lang
loc va » hoc va, luc 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 ((va lang) or (o lang)) xa hoi. ((hieu va) OR (hieu qua)) dao loc va hanh noi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((va lang) OR (o lang)) xa hoi. ((hieu va) OR (hieu qua)) dao loc va hanh noi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((va lang) or (o lang)) xa hoi. ((hieu va) OR (hieu qua)) dao loc va hanh noi cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((va lang) or (o lang)) xa hoi. ((hieu va) OR (hieu qua)) dao loc va hanh noi cua tre*.