Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
nang ho » nang hoc, nang co, tang ho
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
danh vi » hanh vi, dinh vi, danh di
te sach » toc sach
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((nang x) or (nang ho)) hoi. hieu van cam ((duc va) or (tuc xa)) danh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang x) OR (nang ho)) hoi. hieu van cam ((duc va) OR (tuc xa)) danh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang x) or (nang ho)) hoi. hieu van cam ((duc va) or (tuc xa)) danh vi cua viet*.