Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
benh noi » benh hoc, hanh noi, anh noi
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
y nang » ky nang, ly nang, v nang
ben di » ben dai, bien di, den di
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: hoc sach y nang xa hoi. hieu van cam duc tan ((ben di) or (benh noi)) ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang xa hoi. hieu van cam duc tan ((ben di) OR (benh noi)) ((cua tu) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y nang xa hoi. hieu van cam duc tan ((ben di) or (benh noi)) ((cua tu) OR (cua su))*".