Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
soc van » hoc van, sac van, soc dan
cua tre » cua te, cuu tre, cua triet
sac ky » sai ky
oc van » hoc van, luoc van, quoc van
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (cac ky)) nang xa hoi. hieu su cham ((soc van) OR (oc van)) anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang xa hoi. hieu su cham ((soc van) OR (oc van)) anh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) nang xa hoi. hieu su cham ((soc van) OR (oc van)) anh va cua tre*".