Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
ca tren » cu tren, la tren, co tren
va hanh » van hanh, va thanh, ban hanh
qua cau » quan cau, qua cac, qua ca
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: su sach ky lang xa hoi. hieu qua cau truc ((va hanh) OR (va danh)) va ((cau tren) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu qua cau truc ((va hanh) OR (va danh)) va ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu qua cau truc ((va hanh) OR (va danh)) va ((cau tren) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu qua cau truc ((va hanh) OR (va danh)) va ((cau tren) or (ca tren))*.