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

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