Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
day thanh » dao thanh, dat thanh, da thanh
thuc day » thuc dan, thuc vat
hoc khoi » hoc khoa, hoc hoa, hoc noi
thu sac » thu sach, thu san, thu xac
hieu ve » hieu va, hieu van
ve phap » va phap, de phap, ve phan
noi hoi » noi doi, doi hoi, hoi hoi
sac ky » cac ky, sai ky
di cua » doi cua, de cua, do cua

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

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