Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hang vi » hanh vi, hang di, khang voi
cua tre » cua te, cuu tre, cua triet

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