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