Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ve triet » va trien, su triet
ty hoang » ty hang, huy hoang, thi hoang
hoang xa » hoang ha, hoang va, hoang xuan
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
van lam » van nam
duc ban » duc van, dua ban, duc man

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty hoang xa hoi. hieu van lam ((duc ban) OR (duc tan)) thanh van ((cua tre) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hoang xa hoi. hieu van lam ((duc ban) OR (duc tan)) thanh van ((cua tre) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hoang xa hoi. hieu van lam ((duc ban) OR (duc tan)) thanh van ((cua tre) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty hoang xa hoi. hieu van lam ((duc ban) OR (duc tan)) thanh van ((cua tre) or (ve triet))*.