Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
minh vi » minh voi, dinh vi, minh va
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach y ((nang xa) or (lang xa)) hoi. hieu va kham ((xuc van) OR (luc van)) minh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((nang xa) OR (lang xa)) hoi. hieu va kham ((xuc van) OR (luc van)) minh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y ((nang xa) or (lang xa)) hoi. hieu va kham ((xuc van) OR (luc van)) minh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: bo sach y ((nang xa) or (lang xa)) hoi. hieu va kham ((xuc van) OR (luc van)) minh vi cua tre*.