Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
hang nong » thang long, han tong
manh toan » thanh toan, anh tuan, tinh toan
van thanh » ban thanh, van tuan
trinh va » trinh van, trinh vat, trinh ve
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: hoc thieu sach - hanh trinh va hang nong ((manh toan) or (van thanh)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh trinh va hang nong ((manh toan) OR (van thanh)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh trinh va hang nong ((manh toan) or (van thanh)) tap*.