Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
sach thi » sach thu, sach tai, sach thieu
tham duc » pham duc, than duc, thach duc
thi nang » thi cong, ki nang, thi hanh
tham du » thap du, tham do, pham duc
lap cua » lai cua, tap cua, lam cua
su sach » so sach, vu sach
x hoi » o hoi, x ho, 5 hoi

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 thi nang ((x hoi) or (xa hoi)). hieu van ((tham duc) or (tham du)) ban thanh lap cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi nang ((x hoi) OR (xa hoi)). hieu van ((tham duc) OR (tham du)) ban thanh lap cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach thi nang ((x hoi) or (xa hoi)). hieu van ((tham duc) or (tham du)) ban thanh lap cua viet*.