Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
dan hanh » dang hanh, dan khanh, dan thanh
hanh di » hanh vi, hanh de, hang di
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua
sac ky » cac ky
co hoi » co hoc, co loi
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 ((sac ky) OR (sai ky)) nang co hoi. hieu ve ((pham thuc) or (nham thuc)) dan hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) nang co hoi. hieu ve ((pham thuc) OR (nham thuc)) dan hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (sai ky)) nang co hoi. hieu ve ((pham thuc) or (nham thuc)) dan hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) nang co hoi. hieu ve ((pham thuc) or (nham thuc)) dan hanh di cua te*.