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, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cong van » cong vang, cong san, song van
chat tap » chat thai, chat va, han tap
chat tai » chat thai, cao tai, khau tai

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