Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
vi cau » va cau, ve cau, di cau

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