Perhaps you should try some spelling variations:
sach tranh » canh tranh
bach thoat » bach khoa, bach hoa, dich thoat
cach thuc » anh thuc, cac thu
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
tranh thi » tranh thai, tran thi, trinh thi
thuc thi » thuc thai, thuc thuc, thuc te
thi hanh » thi thanh
khoa pho » khoa phu, khoa khoa, khoa phau
thi bach » thi bich, thi anh, thi binh
su cach » tu cach, su cac, cuu cach
su sach » so sach, vu sach
khoi » hoi, thoi, khi
khong » phong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su cach thuc thi hanh khoa pho thong ) or ( su sach tranh thi bach thoat khoi khong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su cach thuc thi hanh khoa pho thong ) OR ( su sach tranh thi bach thoat khoi khong )).
• Adding a wildcard symbol may retrieve word variants: (( su cach thuc thi hanh khoa pho thong ) or ( su sach tranh thi bach thoat khoi khong ))*.