Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh tai » thanh hai, thanh toan, doanh tai
vien cap » vien cac, vien cao, vien can
cap nuoc » dat nuoc
hanh tai » hang tai, han tai, hinh tai
nuoc van » nuoc va, nuoc san, luoc van
sach ky » sac ky, sach ty, sach kem
nang co » nang cao, nang doc, nang noi
cuc tre » duc tre, cua tre, cuu tre
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: su ((sach ky) OR (sach y)) nang co hoi. hieu vien cap nuoc van ((hanh tai) or (thanh tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang co hoi. hieu vien cap nuoc van ((hanh tai) OR (thanh tai)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang co hoi. hieu vien cap nuoc van ((hanh tai) or (thanh tai)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang co hoi. hieu vien cap nuoc van ((hanh tai) or (thanh tai)) cuc tre*.