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