Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
vi cua » vai cua, di cua
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) or (so sanh)) ky lang xa hoi. hieu va cam tuc ((va danh) OR (va dinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky lang xa hoi. hieu va cam tuc ((va danh) OR (va dinh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky lang xa hoi. hieu va cam tuc ((va danh) OR (va dinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky lang xa hoi. hieu va cam tuc ((va danh) OR (va dinh)) vi cua tre*.