Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
bach trong » hoach trong, bai trong, anh trong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
hoc thong » hoc thuong, hoc trong, hoc hong
trong thu » trong nha
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
khoa hoc » hoa hoc
thu bach » thi bach, thu sach, thu hoach
bach kho » bach khoa, bac ho, benh kho
kho khan » khoa kham, khoa than
vu sach » su sach, vu khach

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 tri thuc hang khoa hoc thong ) or ( vu bach trong thu bach kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach tri thuc hang khoa hoc thong ) OR ( vu bach trong thu bach kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( vu sach tri thuc hang khoa hoc thong ) or ( vu bach trong thu bach kho khan thong ))*.