Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » thong cong, hang cong, nhung don
trung thi » truong thi, trong thi, trung tri
dung cong » dung trong
san ran » san van, san roman, van ranh
ran cau » van cau, ban cau, can cau

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