Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
ve cam » ve cham, ve cac, va cam
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang x) OR (sang ma)) hoi. hieu ve cam xuc ((va danh) OR (ca dao)) vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang x) or (sang ma)) hoi. hieu ve cam xuc ((va danh) or (ca dao)) vi cau tren*.