Perhaps you should try some spelling variations:
hoach trien » hoach chien
trien thuc » trien thuoc, tren thuc, trien thuat
khan thong » khap thong, khau thong, nhan thong
sach triet » sach thieu, sach tien, sach tren
thuc sach » thuoc sach, thu sach, thuc cach
sinh khoa » sinh hoc, sinh hoat, anh khoa
pho thong » he thong
sach kho » bach khoa, sach dao, sach nha
kho khan » khoa kham, khoa than
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te 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 sach kho khan thong ) or ( tu sach triet hoc sinh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach trien thuc sach kho khan thong ) OR ( tu sach triet hoc sinh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach trien thuc sach kho khan thong ) or ( tu sach triet hoc sinh khoa pho thong ))*.