Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dieu cua » dieu tra
dieu can » dieu hanh, tiep can
huu phuc » huu thuc, huu phach, huu duc
hieu su » hieu sau, tieu su, hieu so
phuc va » phuc vu, thuc va, chuc va
hieu vu » hieu va, hieu ve, dieu vu
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va dac » va cac, va dao, va dau

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 vu) or (hieu su)) huu phuc va dac ((dieu can) or (dieu cua)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang xa hoi. ((hieu vu) OR (hieu su)) huu phuc va dac ((dieu can) OR (dieu cua)) treo.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang xa hoi. ((hieu vu) or (hieu su)) huu phuc va dac ((dieu can) or (dieu cua)) treo*.