Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, thuc vat
nang xa » nang x, lang xa, nang ma
van cuu » van cau, van chu, van cu
hanh de » hanh ve, hanh kem
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 nang xa hoi. hieu van cuu ((thuc dan) or (hoc dan)) hanh de ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van cuu ((thuc dan) OR (hoc dan)) hanh de ((cua tu) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van cuu ((thuc dan) or (hoc dan)) hanh de ((cua tu) OR (cua su))*".