Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
hieu van » hieu va, thien van, lieu va
dau tren » dau tien, dat tren, dau trong
te sach » toc sach
dang xa » dang xay, lang xa, dang ha
nam tuc » nam thuc, nam truc, nam tu
dan vat » dang vat, van vat, dan va
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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 _ dang xa hoi. hieu van nam tuc va dan vat ((cua tre) or (((dau tren) OR (dau tieng))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach _ dang xa hoi. hieu van nam tuc va dan vat ((cua tre) OR (((dau tren) OR (dau tieng)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach _ dang xa hoi. hieu van nam tuc va dan vat ((cua tre) or (((dau tren) OR (dau tieng))))".
• Adding a wildcard symbol may retrieve word variants: te sach _ dang xa hoi. hieu van nam tuc va dan vat ((cua tre) or (((dau tren) OR (dau tieng))))*.