Perhaps you should try some spelling variations:
kham quoc » kham cuoc, khanh quoc, han quoc
quoc van » quoc va, quoc ban, quoc lan
sach ky » sac ky, sach ty, sach kem
hanh di » hanh de, hang di, danh di
su kham » su pham, vu kham, so kham
hieu su » hieu sau, tieu su, hieu so
nang xa » nang x, lang xa, nang ma
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) nang xa hoi. hieu su kham quoc van ((hanh di) OR (hanh vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. hieu su kham quoc van ((hanh di) OR (hanh vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang xa hoi. hieu su kham quoc van ((hanh di) OR (hanh vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang xa hoi. hieu su kham quoc van ((hanh di) OR (hanh vi)) cua te*.