Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
thu xac » thau xay
doi cua » hoi cua
hieu ve » hieu va, hieu van
ve phap » va phap, de phap, ve phan
hoc hoi » hoc khoi, hoc hoa, hoc noi
noi hoi » noi doi, doi hoi, hoi hoi
xac ky » cac ky, sac ky, bac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu xac ky nang ((noi hoi) or (hoc hoi)). hieu ve phap thuc day hanh ((doi cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky nang ((noi hoi) OR (hoc hoi)). hieu ve phap thuc day hanh ((doi cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: thu xac ky nang ((noi hoi) or (hoc hoi)). hieu ve phap thuc day hanh ((doi cua) or (dai cua)) te*.