Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
sach ngan » sach ngon, sach nha, sach nang
trinh ly » trinh ky, trinh do, trinh tu
sach han » sach tham, sach danh, sach nang
tu canh » thu canh, tu chanh, tu can
ly khi » ly 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: (( tu canh trinh ly khi đong luc ) or ( thu ((sach ngan) or (sach han)) ky khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh trinh ly khi đong luc ) OR ( thu ((sach ngan) OR (sach han)) ky khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh trinh ly khi đong luc ) or ( thu ((sach ngan) or (sach han)) ky khi đong luc ))*.