Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
sach tren » sach tien, sach tranh
hoach hoa » hoach ha, hoach hoi, hoach toan
phan hong » phan cong, pham hong, phan song
sach tri » sach tai, sach truc, sach bai
tri truc » tri thuc, thi truc, tri thuoc
bach kho » bach khoa, bac ho, benh kho
kho khan » khoa kham, khoa than
tren quy » trien quy, tran quy, tren que
hoa phan » hoa dan, co phan
tu sach » thu sach, su sach, tu cach
te sach » toc sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tri truc bach kho khan thong ) or ( te sach tren quy hoach hoa phan hong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri truc bach kho khan thong ) OR ( te sach tren quy hoach hoa phan hong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri truc bach kho khan thong ) or ( te sach tren quy hoach hoa phan hong ))*.