Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
cach phong » cac phong, bach phuong, cac phuong
phong phap » phuong phap, chong phap, khong phap
phap thong » phap phong, phap chong, pho thong
bai thuat » giai thuat, bai thuyet, ki thuat
khai phan » khai pha, hai phan, thai phan
cach tren » sach tren, cach thien, cach bien
sach bai » sach dao, cac bai, sach xa
thuat do » thuat o
tren tue » tren que, tren thuc, tri tue
tue cach » thuc cach, ve cach, cuu cach
su sach » so sach, vu sach
do khai » do thai, do hai, dao khau
tu cach » tu cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach bai thuat do khai phan thong ) or ( tu cach tren tue cach phong phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach bai thuat do khai phan thong ) OR ( tu cach tren tue cach phong phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach bai thuat do khai phan thong ) or ( tu cach tren tue cach phong phap thong ))*.