Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
khap thong » phap thong, khau thong, khac thuong
cach thuc » anh thuc, cac thu
thuc thuc » hoc thuc
phu thong » pho thong, phap thong, khau thong
khoa khap » khoa kham, khoa khac, kho khan
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa phu » khoa phau, khoa thu, hoa phu
tu cach » tu cac
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 cach thuc thuc cac khoa phu thong ) or ( te sach trien thuc cac khoa khap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thuc thuc cac khoa phu thong ) OR ( te sach trien thuc cac khoa khap thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thuc thuc cac khoa phu thong ) or ( te sach trien thuc cac khoa khap thong ))*.