Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
ve pham » vi pham, v pham, ve phan
doi cua » dai cua, hoi cua
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
de cua » le cua, te cua, dieu cua
sac ky » cac ky
co hoi » co hoc, co loi

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 dan hanh ((doi cua) or (de 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 dan hanh ((doi cua) OR (de 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 dan hanh ((doi cua) or (de cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) nang co hoi. hieu ve pham thuc dan hanh ((doi cua) or (de cua)) te*.