Perhaps you should try some spelling variations:
trinh khong » tinh khong, trinh khung, thinh khong
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
khong khi » khong he
sach dao » lanh dao
cao khai » cao chat, co khi, cao tai
te sach » toc sach
dao cao » dao tao, bao cao, tao cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach dao cao khai đong luc ) or ( ((thuoc sach) or (thuat sach)) trinh khong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dao cao khai đong luc ) OR ( ((thuoc sach) OR (thuat sach)) trinh khong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dao cao khai đong luc ) or ( ((thuoc sach) or (thuat sach)) trinh khong khi đong luc ))*.