Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
toc sach » hoc sach, doc sach, thuoc sach
nuoc san » nuoc luan, nguoi san, nuoc quan
dao nuoc » dat nuoc, dao cuoc, dau nuoc
cuu tre » cua tre, cau treo
san anh » van anh, lan anh, sat anh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tu lang » cu lang, tu lanh, xu lang
anh vi » hanh vi, anh va, anh ve
va dao » ca dao

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) OR (toc sach)) tu lang xa hoi. hieu va dao nuoc san anh vi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu lang xa hoi. hieu va dao nuoc san anh vi ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu lang xa hoi. hieu va dao nuoc san anh vi ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) tu lang xa hoi. hieu va dao nuoc san anh vi ((cuu tre) or (cau tren))*.