Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
su triet » su viet, su tien, ve triet
hoang xa » hoang ha, hoang va, hoang xuan
hieu van » hieu va, thien van, lieu va
sach thi » sach thu, sach tai, sach thieu
cuu tre » cua tre, cau tren, cau treo
su sach » so sach, vu sach
cuc ban » cua ban, cac ban, cuu ban
lam cuc » lam cua, lam duoc, pham cuc
hang xa » hang va, hang ca, lang xa
van lam » van nam

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 ((hang xa) OR (hoang xa)) hoi. hieu van lam cuc ban thanh van ((cuu tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi ((hang xa) OR (hoang xa)) hoi. hieu van lam cuc ban thanh van ((cuu tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi ((hang xa) OR (hoang xa)) hoi. hieu van lam cuc ban thanh van ((cuu tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach thi ((hang xa) OR (hoang xa)) hoi. hieu van lam cuc ban thanh van ((cuu tre) or (su triet))*.