Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh vai » hanh vi, hanh tai, hanh van
te sach » toc sach
dua ban » dia ban, cua ban, qua ban
hanh va » hang va, hanh vi
cau dua » cau qua, cau cua, ca dua
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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

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