Perhaps you should try some spelling variations:
sach tranh » canh tranh
thuoc tinh » thuc tinh, thuoc sinh, thuoc hinh
tinh thanh » dinh thanh, tinh toan, tinh hinh
thanh ky » hanh ky, than ky, thanh tay
tu sach » thu sach, su sach, te sach
hoa khi » hoa hi, hoa thi, hoc khi
hoa phi » hoa phan, hoa thai
ky khi » ky thi, ly khi

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 ((hoa khi) or (hoa phi)) đong luc ) or ( thuoc tinh thanh ky khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tranh ((hoa khi) OR (hoa phi)) đong luc ) OR ( thuoc tinh thanh ky khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tranh ((hoa khi) or (hoa phi)) đong luc ) or ( thuoc tinh thanh ky khi đong luc ))*.