Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
lanh tranh » canh tranh, lan tranh, hanh trinh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
cong van » cong vang, cong san, song van
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) OR (chieu sach)) - ((lanh tranh) or (hanh trang)) va nhung cong van chat thai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - ((lanh tranh) OR (hanh trang)) va nhung cong van chat thai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (chieu sach)) - ((lanh tranh) or (hanh trang)) va nhung cong van chat thai".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (chieu sach)) - ((lanh tranh) or (hanh trang)) va nhung cong van chat thai*.