Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
dang ha » dong ha, dung ha, lang ha
ty dang » ty xang, ky dang, ty hang
cuu tre » cua tre, cau tren, cau treo
vu sach » vu bach, su sach, vu khach
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty dang ha hoi. hieu van nam thuc va ((thanh vi) or (thanh va)) ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty dang ha hoi. hieu van nam thuc va ((thanh vi) OR (thanh va)) ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty dang ha hoi. hieu van nam thuc va ((thanh vi) or (thanh va)) ((cuu tre) or (cua triet))*.