Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
phan tap » phan lap, pha tap, phan tu
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - hanh trinh vat ((nhung cong) or (dung cong)) ban ((phan tap) OR (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh trinh vat ((nhung cong) OR (dung cong)) ban ((phan tap) OR (han tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh trinh vat ((nhung cong) or (dung cong)) ban ((phan tap) OR (han tap))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh trinh vat ((nhung cong) or (dung cong)) ban ((phan tap) OR (han tap))*.