Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
hoc sach » hoc sinh, hoc cac, hoc anh
lo hang » ly hang, le hang, cho hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
soc va » hoc va, loc va, doc va
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nuoc sach) OR (hoc sach)) lo hang xa hoi. ((hieu van) or (hieu va)) cham soc va hanh vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc sach) OR (hoc sach)) lo hang xa hoi. ((hieu van) OR (hieu va)) cham soc va hanh vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nuoc sach) OR (hoc sach)) lo hang xa hoi. ((hieu van) or (hieu va)) cham soc va hanh vai cua su".
• Adding a wildcard symbol may retrieve word variants: ((nuoc sach) OR (hoc sach)) lo hang xa hoi. ((hieu van) or (hieu va)) cham soc va hanh vai cua su*.