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
trinh van » trinh han, trinh quan, trinh toan
tong cong » trong cong, cong cong, dung cong
van thanh » ban thanh, van tuan
manh toan » thanh toan, anh tuan, tinh toan
van tong » van thong, van trong, van tuong

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 van tong cong ((van thanh) or (manh toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh trinh van tong cong ((van thanh) OR (manh toan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh trinh van tong cong ((van thanh) or (manh toan)) tap*.