Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
van chat » cao chat
chat tap » chat tai, chat thai, chat va

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

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