Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cong van » cong vang, cong san, song van
chat tap » chat thai, chat va, han tap
chat tai » chat thai, cao tai, khau tai
va dung » van dung, va duong, vat dung

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 (thanh trung)) va dung 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 (thanh trung)) va dung cong van ((chat tap) OR (chat tai)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((hanh tranh) or (thanh trung)) va dung cong van ((chat tap) or (chat tai))*.