Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
viet cua » viec cua, biet cua, nhiet cua
viet qua » vien quan, ket qua, viet ha
doc sac » doc sach, dac sac, hoc sach
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
viet ca » viet ha, viet co, viet a
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sac ky nang xa hoi. hieu van nham thuc va danh ((((viet cua) or (viet ca))) or (viet qua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang xa hoi. hieu van nham thuc va danh ((((viet cua) OR (viet ca))) OR (viet qua)) tre.
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang xa hoi. hieu van nham thuc va danh ((((viet cua) or (viet ca))) or (viet qua)) tre*.