Perhaps you should try some spelling variations:
cac truc » cac tru, cac trung, sach truc
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh ca » dan ca, doanh cua, danh cho
cuu tre » cua tre, cau treo

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