Perhaps you should try some spelling variations:
sach trinh » hanh trinh, sach kinh, sach tren
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
trinh han » trinh quan
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, te sach, tu cach
han khi » ban khi, van khi, than khai
su sach » so sach, vu sach

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

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