Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trang » thanh trung, canh tranh, hanh trinh
thuat bang » thuat ban, thuat mang, thuat nang
hien sach » dien sach, kien sach, chieu sach
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
tuan bang » tuan dang, tuan hoang, tuong bang
trang va » tran van, hang va
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 ((hien sach) or (thien hach)) - hanh trang va dung cong vang ((tuan bang) OR (thuat bang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - hanh trang va dung cong vang ((tuan bang) OR (thuat bang)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (thien hach)) - hanh trang va dung cong vang ((tuan bang) OR (thuat bang))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - hanh trang va dung cong vang ((tuan bang) OR (thuat bang))*.