Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van hai
day ban » tay ban, da ban, day dan
hai su » hai vu, lai su, hai so

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 ty nang xa hoi. hieu ((van hac) or (van ban)) day ban thanh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((van hac) OR (van ban)) day ban thanh hai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((van hac) or (van ban)) day ban thanh hai su triet*.