Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
cau duc » cao duc, cau luc, chu duc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ly lang » ly hang, ly vang, le lang

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

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