Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thuat dbo » thuat do, thuat dao, thuat duoc
su thuat » su thua, thu thuat, cuu thuat
ty thuat » ky thuat, my thuat, te thuat
dbo khi » bo khi
sach ty » sach y, sach tu, sach thu
thuat o » thuat do
o khi » co khi, bo khi

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 su thuat dbo khi ) or ( thuat sach ty thuat o khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach su thuat dbo khi ) OR ( thuat sach ty thuat o khi )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach su thuat dbo khi ) or ( thuat sach ty thuat o khi ))*.