Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh tranh » canh tranh, lanh tranh, nhanh thanh
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
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 - ((((hanh tranh) OR (hanh trang))) or (hanh trinh)) va nhung 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))) OR (hanh trinh)) va nhung 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))) or (hanh trinh)) va nhung cong van chat thai".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((((hanh tranh) OR (hanh trang))) or (hanh trinh)) va nhung cong van chat thai*.