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
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
phan tap » han tap, pha tap, phan tu
phan lap » phan dau

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