Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
phap thong » phap phong, phap chong, pho thong
tham thuc » nham thuc, pham thuc, tam thuc
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa phap » khoa phau, khoan phai, khong phap
sach tai » sach bai, sach tham, sach dao
tuc dung » thuc dung, tac dung, duc dung
dung kho » dung khoa, dung khoc, dung cho
kho khan » khoa kham, khoa than
tot tham » tot thang, so tham, thi tham
tu sach » thu sach, su sach, te sach
tai tuc » thai tuc, tai cuc, tai tu
tu tot » tu cot, tu txt

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 tai tuc dung kho khan thong ) or ( tu tot tham thuc bach khoa phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tai tuc dung kho khan thong ) OR ( tu tot tham thuc bach khoa phap thong ))*.