Perhaps you should try some spelling variations:
hoach trien » hoach chien
trien thuc » trien thuoc, tren thuc, trien thuat
khan thong » khap thong, nhan thong, phan thong
tham thuoc » pham thuoc, tham thuc, nha thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
khau thong » khau thuong, khap thong, khau tong
sach tham » sach nha
sach khoa » bach khoa, sach nha, anh khoa
khoa khau » khoa kham, khoa phau, khoa chau
thuc dac » thuoc dac, thuc dan, thuc day
kho khan » khoa kham, khoa than
dac kho » dac khoa, dac khao, dac cho
su sach » so sach, vu sach

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 trien thuc dac kho khan thong ) or ( su sach tham thuoc sach khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach trien thuc dac kho khan thong ) OR ( su sach tham thuoc sach khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach trien thuc dac kho khan thong ) or ( su sach tham thuoc sach khoa khau thong ))*.