Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
nganh cong » nhanh chong, thanh cong
cong khi » cong thai, khong khi, co khi
su sach » so sach, vu sach
su cac » tu cac, su can, eu cac
su cao » cu cao, vu cao, su co

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tranh cong khi đong luc ) or ( ((su cac) or (su cao)) nganh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tranh cong khi đong luc ) OR ( ((su cac) OR (su cao)) nganh cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tranh cong khi đong luc ) or ( ((su cac) or (su cao)) nganh cong khi đong luc ))*.