Perhaps you should try some spelling variations:
thanh ve » thanh va, thanh vien, thanh van
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
hanh ve » hanh vi, hanh va, hanh kem
ty hang » ly hang, ty xang, thi hang
bach ty » sach ty, xach tay, bach thu
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
hang ca » hang va, nang cao, hang tai
ca hoi » cau hoi, cua hoi, xa hoi
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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

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