Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
nay tuc » cay thuc, day thuc
cuu tre » cua tre, cau tren, cau treo
dan vat » dang vat, van vat, dan va
te sach » toc sach
danh xa » danh ca, dinh xa, canh xa
hieu va » lieu va, hieu qua
sach 2 » sach y
nay tu » tay tu, may tu
va dan » ca dan, va dao, va dau
2 danh » 1 danh

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 2 danh xa hoi. hieu va ((nay tuc) OR (nay tu)) va dan vat ((cuu tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 danh xa hoi. hieu va ((nay tuc) OR (nay tu)) va dan vat ((cuu tre) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 danh xa hoi. hieu va ((nay tuc) OR (nay tu)) va dan vat ((cuu tre) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach 2 danh xa hoi. hieu va ((nay tuc) OR (nay tu)) va dan vat ((cuu tre) or (dau tren))*.