Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
phu thong » pho thong, phap thong, khau thong
tuc cach » thuc cach, tu cach, truoc cach
cach kho » bach khoa, cach thoi, cach pha
kho khan » khoa kham, khoa than
sach tri » sach tai, sach tren, sach truc
tro tuc » tro tu, trong tuc, tron thuc
su sach » so sach, vu sach
tri tuc » tri thuc, tri tue, tri tac
tuc cac » tich cac
cac hoa » cac hoat, cac khoa, cau hoa
hoa phu » khoa phu, hoa phi, hoi phu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac tro tuc cach kho khan thong ) or ( su sach tri tuc cac hoa phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac tro tuc cach kho khan thong ) OR ( su sach tri tuc cac hoa phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cac tro tuc cach kho khan thong ) or ( su sach tri tuc cac hoa phu thong ))*.