Perhaps you should try some spelling variations:
thien van » thi van
phan thuc » nhan thuc, phap thuc, pham thuc
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, lieu va, hieu ve
hanh di » hanh vi, hanh de, hang di
sach ky » sach y, sach ty, sach kem
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
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 ((sach ky) OR (sac ky)) nang co hoi. ((hieu van) or (thien van)) phan thuc dan hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang co hoi. ((hieu van) OR (thien van)) phan thuc dan hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang co hoi. ((hieu van) or (thien van)) phan thuc dan hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang co hoi. ((hieu van) or (thien van)) phan thuc dan hanh di cua te*.