Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tho lang » thon lang, cho lang, tho nang
thu bang » thu ban, thu hang, chu bang
hieu va » lieu va, hieu qua
va chua » vua chua, ca chua, va chu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
bao duc » dao duc, bao luc, cao duc
chua tu » chu tu, cua tu, chua cu
hieu ve » hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((tho lang) or (thu bang)) xa hoi. ((hieu ve) OR (hieu va)) bao duc va hanh va chua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tho lang) OR (thu bang)) xa hoi. ((hieu ve) OR (hieu va)) bao duc va hanh va chua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tho lang) or (thu bang)) xa hoi. ((hieu ve) OR (hieu va)) bao duc va hanh va chua tu".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tho lang) or (thu bang)) xa hoi. ((hieu ve) OR (hieu va)) bao duc va hanh va chua tu*.