Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
doi cua » hoi cua
y nang » ky nang, ly nang, v nang
di cua » de cua, do cua, da cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu va cac nuoc va dinh ((di cua) or (((doi cua) or (dai cua)))) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu va cac nuoc va dinh ((di cua) OR (((doi cua) OR (dai cua)))) te.
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu va cac nuoc va dinh ((di cua) or (((doi cua) or (dai cua)))) te*.