Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
loai cua » lai cua, loai ca, loai chat
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, sach thu
te sach » toc sach
sang xa » song xa, lang xa, mang xa
sang ma » tang ma, nang ma, sang tao
cua tre » cua te, cuu tre, cua triet
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao

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 ((sang xa) or (sang ma)) hoi. hieu van cam duc ((va dan) OR (ca dan)) loai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((sang xa) OR (sang ma)) hoi. hieu van cam duc ((va dan) OR (ca dan)) loai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((sang xa) or (sang ma)) hoi. hieu van cam duc ((va dan) OR (ca dan)) loai cua tre*".