Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
va triet » va thiet, va trien, ve triet
sach ky » sach y, sach ty, sach kem
cuu ban » cuu van, cua ban, cuu san
cuc ban » cua ban, cac ban, duc ban
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
hai va » hai van, thai va, hoi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang xa hoi. hieu va cam ((cuc ban) OR (cuu ban)) thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu va cam ((cuc ban) OR (cuu ban)) thanh hai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang xa hoi. hieu va cam ((cuc ban) OR (cuu ban)) thanh hai va triet*".