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
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ca tren » cu tren, la tren, co tren

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 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 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 va ((cau tren) OR (ca tren))*.