Perhaps you should try some spelling variations:
pham thuc » pham chuc, pham thu, pham thi
phap thuc » phap thu, phap hoc, phap tu
nham thuc » nhan thuc, nam thuc, nham thu
nang noi » nang doc
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
noi hoi » noi doi, doi hoi, hoi hoi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

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