Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
sach ngan » sach ngon, sach nha, sach han
thu canh » thuc hanh, thu cong, thu ban
trinh ly » trinh ky, trinh do, trinh tu
thu sach » tu sach, thuat sach, thuoc sach
ly khi » ly chi
my khi » my chi
ky khi » ky thi

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

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