Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vinh cuu » dinh cuu, sinh cua, dinh cu
dao vinh » dao minh, dao dinh, dao tinh
cac sau » cac san, ca sau, cac mau
sach ky » sac ky, sach ty, sach kem
cuu tre » cua tre, cau tren, cau treo
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
cac su » cach su, cac du, cac tu
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang co hoi. hieu vien ((cac su) OR (cac sau)) va dao vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang co hoi. hieu vien ((cac su) OR (cac sau)) va dao vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang co hoi. hieu vien ((cac su) OR (cac sau)) va dao vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang co hoi. hieu vien ((cac su) OR (cac sau)) va dao vinh cuu tre*.