Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
theo luong » tien luong
luong thi » luong tai
cau sach » cao sach, hau sach, khau sach
rau sach » hau sach, khau sach, nam sach
trinh va » trinh van, trinh vat, trinh ve
thi toan » thi tran, thi hoan, thi loan
toan cau » toan cao, toan ban, toan tap
va theo » va thep, va thiet, va thuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((cau sach) OR (rau sach)) - hanh trinh va theo luong thi toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((cau sach) OR (rau sach)) - hanh trinh va theo luong thi toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((cau sach) OR (rau sach)) - hanh trinh va theo luong thi toan cau*.