Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
vien dai » hien dai
dai nuoc » dat nuoc, dau nuoc, dai luoc
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
hoi cua » hoi chuc
doi cua » dai cua
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang

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) or (toc sach)) ly hang xa hoi. hieu vien dai nuoc van hanh ((doi cua) OR (hoi cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly hang xa hoi. hieu vien dai nuoc van hanh ((doi cua) OR (hoi cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ly hang xa hoi. hieu vien dai nuoc van hanh ((doi cua) OR (hoi cua)) tu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ly hang xa hoi. hieu vien dai nuoc van hanh ((doi cua) OR (hoi cua)) tu*.