Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
lai cuu » lai cua, lai chau, lai cuoc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
va cam » va cham, va cac, va cao

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 y ((nang xa) or (lang xa)) hoi. hieu va cam duc ((va hanh) OR (va danh)) lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu va cam duc ((va hanh) OR (va danh)) lai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (lang xa)) hoi. hieu va cam duc ((va hanh) OR (va danh)) lai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (lang xa)) hoi. hieu va cam duc ((va hanh) OR (va danh)) lai cuu tre*.