Perhaps you should try some spelling variations:
sach thanh » sach tranh, sach tham, danh thanh
canh trinh » canh tranh, hanh trinh, canh tinh
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » thuat sach, thuoc sach, thu hoach
thap tai » phap tai, tap tai, thai tai
trinh do » trinh ky
tu sach » su sach, te sach, tu cach
su canh » suc canh, su can, su anh
vu sach » vu bach, su sach, vu khach

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) OR (thu sach)) thap tai ) or ((( su canh trinh do ) or ( vu sach thanh tai ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu sach) OR (thu sach)) thap tai ) OR ((( su canh trinh do ) OR ( vu sach thanh tai )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tu sach) OR (thu sach)) thap tai ) or ((( su canh trinh do ) or ( vu sach thanh tai ))))".
• Adding a wildcard symbol may retrieve word variants: (( ((tu sach) OR (thu sach)) thap tai ) or ((( su canh trinh do ) or ( vu sach thanh tai ))))*.