Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
lang vi » hang vi, sang vi, lang viet
lang va » lang van, hang va, lang ha
y nang » ky nang, ly nang, v nang
cua te » cua tu

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 hoi. hieu va cac nuoc va ((lang vi) OR (lang va)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu va cac nuoc va ((lang vi) OR (lang va)) cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va cac nuoc va ((lang vi) OR (lang va)) cua te*.