Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
hieu van » hieu va, thien van, lieu va
hoai cua » hoi cua, hoa cua, hoan cua
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam hoc » cao hoc, am hoc, cam hoa
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu van cam hoc dan thanh ((hoai cua) OR (hai cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu van cam hoc dan thanh ((hoai cua) OR (hai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu van cam hoc dan thanh ((hoai cua) OR (hai cua)) tu*.