Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dung doi » huong doi, dung tai, dung co
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
nam tuc » nam thuc, nam truc, nam tu
xa dung » xay dung, xa dong, va dung
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sac ky)) ((nang x) or (nang ma)) hoi. hieu van nam tuc xa dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) ((nang x) OR (nang ma)) hoi. hieu van nam tuc xa dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sac ky)) ((nang x) or (nang ma)) hoi. hieu van nam tuc xa dung doi cua tre*.