Perhaps you should try some spelling variations:
bai thuat » giai thuat, bai thuyet, ki thuat
sach dao » lanh dao
sach bai » cac bai, sach xa
thuat do » thuat o
vu sach » vu bach, su sach, vu khach
phat co » chat co, phai co, nhat co
phan co » phan bo, phan cong, phan cac
do khi » doi khi, do thi, co khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu sach dao ((phat co) or (phan co)) khi ) or ( vu sach bai thuat do khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach dao ((phat co) OR (phan co)) khi ) OR ( vu sach bai thuat do khi )).
• Adding a wildcard symbol may retrieve word variants: (( vu sach dao ((phat co) or (phan co)) khi ) or ( vu sach bai thuat do khi ))*.