Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
khan thong » khap thong, khau thong, nhan thong
thuc cach » thuoc sach, truoc cach, thuc hanh
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
cach phaa » cach phat, mach phan, sach phat
phaa phau » phap phat, phap phan, pham phap
sach tri » sach tai, sach truc, sach bai
tri thuc » tri tue
pha khan » pham khanh, phap khang, phap phan
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: (( tu sach tri thuc cach pha khan thong ) or ( tu sach tren thuc cach phaa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri thuc cach pha khan thong ) OR ( tu sach tren thuc cach phaa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri thuc cach pha khan thong ) or ( tu sach tren thuc cach phaa phau thong ))*.