Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, thanh ca
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
tang van » dang van, hoang van, trong van
cac cua » cach cua, cac qua, ca cua
sanh ky » hanh ky, sang ky, nganh ky
so sanh » do sanh
sang ma » tang ma, nang ma, sang tao
van cam » van nam, van lam, van cau
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky ((sang ma) or (tang van)) hoi. hieu van cam ((luc va) OR (tuc va)) thanh cac cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((sang ma) OR (tang van)) hoi. hieu van cam ((luc va) OR (tuc va)) thanh cac cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky ((sang ma) or (tang van)) hoi. hieu van cam ((luc va) OR (tuc va)) thanh cac cua viet".
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((sang ma) or (tang van)) hoi. hieu van cam ((luc va) OR (tuc va)) thanh cac cua viet*.