Perhaps you should try some spelling variations:
nhanh dung » nhanh dong, hanh dung, nhanh hung
dung thai » duong thai, dung tai, dung hai
thai dung » thai duong, thai vung, thi dung
cong tinh » cong trinh, cong vinh, cong thanh
long tinh » trong tinh, luong tin, dong tin
cau sach » cao sach, hau sach, khau sach
rau sach » hau sach, khau sach, nam sach
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 ((cau sach) or (rau sach)) - nhanh dung thai dung ((cong tinh) OR (long tinh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((cau sach) OR (rau sach)) - nhanh dung thai dung ((cong tinh) OR (long tinh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((cau sach) or (rau sach)) - nhanh dung thai dung ((cong tinh) OR (long tinh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((cau sach) or (rau sach)) - nhanh dung thai dung ((cong tinh) OR (long tinh)) toan cao*.