Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh bao » trinh dao, trinh ban, trinh bay
tranh co » tranh o, tranh cuoc, tranh cua
trinh co » trinh do, trinh cong, trinh hoa
thu hanh » thuc hanh, thu thanh, thuy hanh
tu sach » thu sach, su sach, te sach
bao kha » bao khoa, bat kha, bao ha

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 hanh trinh bao 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 hanh trinh bao kha đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ((tranh co) or (trinh co)) khi đong luc ) or ( thu hanh trinh bao kha đong luc ))*.