Perhaps you should try some spelling variations:
sach tranh » canh tranh
phan thong » phan thuong, phan hong, phan tong
hoach tri » hoach toi, hoach hoi, hoach thu
tranh hoc » thanh hoc, tranh cuoc, tranh duoc
bach khoa » anh khoa
sinh nha » sinh kha, hinh nha, sinh thai
nha phan » nha phat, phap phan, nghe phan
hoc bach » hoc sach, hoc cach, hoc bac
tri hoc » triet hoc, tri thuc, thai hoc
te sach » toc sach
khoa he » hoa he, khoa hoc, khong he

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 tri hoc sinh nha phan thong ) or ( te sach tranh hoc bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach tri hoc sinh nha phan thong ) OR ( te sach tranh hoc bach khoa he thong ))*.