Perhaps you should try some spelling variations:
nguoi khac » nguoi thai, nguoi cham, nguoi nhat
khac xuong » phan xuong
xuong minh » duong minh, luong minh, truong minh
sach hanh » sach danh, sach han, sac hanh
giai toan » giai doan, giai toa, gioi toan
toan tong » toan thong, toan trong, toan cong
tong minh » thong minh, trong minh, song minh
thu sach » thuat sach, thuoc sach, thu hoach
sach ha » sach nha, sach han, sach xa
tu sach » su sach, te sach, tu cach
hanh ve » hanh vi, hanh va, hanh kem
ve giai » va giai, ve giao, de giai
ha cua » hoa cua, hai cua, nha cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach ha cua nguoi khac xuong minh ) or ( tu sach hanh ve giai toan tong minh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach ha cua nguoi khac xuong minh ) OR ( tu sach hanh ve giai toan tong minh )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach ha cua nguoi khac xuong minh ) or ( tu sach hanh ve giai toan tong minh ))*.