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

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