Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
khau thong » khau thuong, khap thong, khau tong
cach khong » cach phong, cac phong, bach khang
hoach tac » hoach toan, hoach thay, hoach xay
tac thuoc » tao thuoc, truc thuoc, tac thuong
khong khi » khong he
khi thong » khi phong, khi tuong, thi thuong
sach cau » sach cap, sach dau, sach mau
cau khau » dau thau, cau hat, dao khau
cach tri » cach thoi, cac tro, cach noi
tu cach » tu cac
le cach » ve cach, loi cach
tri le » thi le, tri lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach tac thuoc sach cau khau thong ) or ( tu cach tri le cach khong khi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach tac thuoc sach cau khau thong ) OR ( tu cach tri le cach khong khi thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach tac thuoc sach cau khau thong ) or ( tu cach tri le cach khong khi thong ))*.