Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh do » trinh ky
thu sach » tu sach, thuat sach, thuoc sach
sach han » sach tham, sach danh, sach nang
do chi » doi chi, do choi, do thi
han my » nhan my, hang my, hoan my
my khi » ly khi, ky khi, my chi

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

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