Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
tieu sach » chieu sach, dien sach, te sach
hanh mang » nhanh mang, nhanh lang, thanh hang
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap
va hang » van hang, va nang, va lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - ((hanh mang) or (hanh trang)) va hang cong dan ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh mang) OR (hanh trang)) va hang cong dan ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh mang) or (hanh trang)) va hang cong dan ((toan tai) or (toan cao))*.