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 » thong cong, hang cong, nhung don
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
van chat » cao chat
thai » tai, thi, hai

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 (dung cong)) van chat thai~.
• 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 (dung cong)) van chat thai.
• 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 (dung cong)) van chat thai".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((hanh tranh) or (hanh trang)) va ((nhung cong) OR (dung cong)) van chat thai*.