Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh bay » trinh may, trinh ban, trinh bao
tranh co » tranh o, tranh cuoc, tranh cua
trinh co » trinh do, trinh cong, trinh hoa
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
bay kha » bat kha, bao kha, may khoa

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 ((tranh co) or (trinh co)) khi đong luc ) or ( thu sach trinh bay kha đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ((tranh co) OR (trinh co)) khi đong luc ) OR ( thu sach trinh bay kha đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ((tranh co) or (trinh co)) khi đong luc ) or ( thu sach trinh bay kha đong luc ))*.