Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
nang noi » nang doc
vat hanh » vat thanh, van hanh, va hanh
sach ty » sach y, sach tu, sach thu
noi hoi » noi doi, doi hoi, hoi hoi
sach ky » sac ky, sach y, sach kem
hieu vi » hieu voi, hieu va, hieu ve
hanh di » hanh vi, hanh de, hang di
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) nang noi hoi. hieu vi pham thuc vat hanh di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang noi hoi. hieu vi pham thuc vat hanh di ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang noi hoi. hieu vi pham thuc vat hanh di ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang noi hoi. hieu vi pham thuc vat hanh di ((cua te) or (cua tu))*.