Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
cac khong » cac phong, cat khong, cac phuong
khoa phau » hoa phan, khoa kham, khoa than
khong he » khong khi, hong ha, khong _
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoan, cac khoi, dac khoa
te sach » toc sach
ve cac » va cac, vien cac
tai le » tri le, tai he, tai lieu
thi le » thi lien
tri ve » tri va, tri le, trinh ve

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 tri ve cac khoa phau thong ) or ( te sach ((tai le) or (thi le)) cac khong he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tri ve cac khoa phau thong ) OR ( te sach ((tai le) OR (thi le)) cac khong he thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tri ve cac khoa phau thong ) or ( te sach ((tai le) or (thi le)) cac khong he thong ))*.