Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
nam luc » nang luc, nhan luc, nam thuc
luc ban » duc ban, cuc ban, luc bat
dang xa » dang xay, dang ha, dang va
cua tre » cua te, cuu tre, dua tren
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu ((dang xa) or (lang xa)) hoi. hieu van nam luc ban thanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((dang xa) OR (lang xa)) hoi. hieu van nam luc ban thanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach thu ((dang xa) or (lang xa)) hoi. hieu van nam luc ban thanh vi ((cua tre) or (cua triet))*.