Perhaps you should try some spelling variations:
khap thong » phap thong, khau thong, khac thuong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa khap » khoa kham, khoa khac, kho khan
sach tham » sach nha
sach tai » sach bai, sach dao, sach xa
tai thuc » thai thuc, tri thuc, dai thuc
tham tuc » tham thuc, thai tuc, nham thuc
tu sach » thu sach, su sach, te sach
tuc cac » tu cac, tich cac
cac hoa » cac hoat, cac khoa, cau hoa
hoa han » hoa phan, hoa dan, hoa van
tong » cong, dong, song

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 thuc hang khoa khap thong ) or ( tu sach tham tuc cac hoa han tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tai thuc hang khoa khap thong ) OR ( tu sach tham tuc cac hoa han tong ))*.