Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien hoat » tien hoa
phap thong » phap phong, phap chong, pho thong
hoat sach » hoa sach, thuat sach, hoc sach
hoach tri » hoach toi, hoach hoi, hoach thu
tri truoc » tri thuoc, tri thuc, gi truoc
truoc cac » truoc cach, truoc cang, truoc cuoc
sach hoa » sach ha, sach hoi, bach hoa
hoa phap » hoa phan, hoc phap, hoa nhap
cac khoa » cac khoan, cac khoi, dac khoa
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: (( te sach trien hoat sach hoa phap thong ) or ( thu hoach tri truoc cac khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trien hoat sach hoa phap thong ) OR ( thu hoach tri truoc cac khoa he thong ))*.