Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
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 x) or (lang xa)) hoi. hieu vu cham ((xuc van) OR (duc van)) minh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((nang x) OR (lang xa)) hoi. hieu vu cham ((xuc van) OR (duc van)) minh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y ((nang x) or (lang xa)) hoi. hieu vu cham ((xuc van) OR (duc van)) minh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: bo sach y ((nang x) or (lang xa)) hoi. hieu vu cham ((xuc van) OR (duc van)) minh vi cua tre*.