Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuy san » thuat san, thuy anh
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
nang mai » nang tai, lang mai, nang cai
nang ma » tang ma, sang ma, nang cao
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
cuu tre » cua tre, cau tren, cau treo
van cam » van nam, van lam, van cau
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuy san ky ((nang mai) or (nang ma)) hoi. hieu van cam duc ban thanh vi ((cuu tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuy san ky ((nang mai) OR (nang ma)) hoi. hieu van cam duc ban thanh vi ((cuu tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thuy san ky ((nang mai) or (nang ma)) hoi. hieu van cam duc ban thanh vi ((cuu tre) or (cua viet))*.