Perhaps you should try some spelling variations:
thuat do » thuat o
va thuat » ky thuat, ki thuat, va thuc
cach tam » cach lam, cach ta, canh tam
tam than » ban than
su sach » vu sach
so sach » so sanh, bo sach, co sach
tu cach » tu cac
than do » than doc, thanh do, than vo
do khi » doi 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: (( ((su sach) OR (so sach)) va thuat do khi ) or ( tu cach tam than do thi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((su sach) OR (so sach)) va thuat do khi ) OR ( tu cach tam than do thi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((su sach) OR (so sach)) va thuat do khi ) or ( tu cach tam than do thi ))".
• Adding a wildcard symbol may retrieve word variants: (( ((su sach) OR (so sach)) va thuat do khi ) or ( tu cach tam than do thi ))*.