Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cac truc » cau truc, cac tru, cac trung
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
va dinh » van dinh, va kinh, va tinh
te sach » toc sach
va danh » va dan, va hanh, dia danh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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