Perhaps you should try some spelling variations:
khong phap » chong phap, khong phai, phuong phap
hanh trinh » canh tranh, hanh chinh
phap thong » phap phong, phap chong, pho thong
vach tran » sach tranh, hach toan, sach tren
tran thuc » trang thuc, toan thuc, tran thuy
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
phu thong » pho thong, khau thong, phan thong
cac khong » cac phong, cat khong, cac phuong
hoc vach » hoc sach, hoc cach, hoc tach
khoa phu » khoa phau, khoa thu, hoa phu
trinh do » trinh ky
vu hanh » vu khanh, vu thanh, du hanh
do cac » o cac, co cac, do cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( hoc vach tran thuc cach khoa phu thong ) or ( vu hanh trinh do cac khong phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( hoc vach tran thuc cach khoa phu thong ) OR ( vu hanh trinh do cac khong phap thong ))*.