Perhaps you should try some spelling variations:
trung xuong » trung uong, trung duong, truong huong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
huong cua » dung cua
xuong dan » huong dan, xuong san, tuong dan
long cua » luong cua, cong cua, dong cua
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - nhanh ((long cua) or (huong cua)) trung xuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - nhanh ((long cua) OR (huong cua)) trung xuong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - nhanh ((long cua) or (huong cua)) trung xuong dan toan cao*.