Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
vien dai » hien dai
benh noi » benh hoc, hanh noi, anh noi
nang xa » nang x, lang xa, nang ma
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
ben dai » benh dai, hien dai
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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 lam duc tan ((((ben dai) OR (vien dai))) or (benh noi)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang xa hoi. hieu van lam duc tan ((((ben dai) OR (vien dai))) OR (benh noi)) cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y nang xa hoi. hieu van lam duc tan ((((ben dai) OR (vien dai))) or (benh noi)) cua tu*".