Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh vat » trinh van, trinh luat, sinh vat
dang cong » dung cong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
dau sach » cau sach, hau sach, rau sach
dat sach » mat sach, dat khach, nam sach
vat dang » van dang, vat dung, va dang
toan cau » toan cao, toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((dau sach) OR (dat sach)) - hanh trinh vat dang cong vang toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((dau sach) OR (dat sach)) - hanh trinh vat dang cong vang toan cau*.