Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
sach ly » sach y, sach ty, sach hay
nang xa » nang x, lang xa, nang ma
sach lo » sach dao, sach doi, sach hoi
loc va » hoc va, luc va
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ly) or (sach lo)) nang xa hoi. hieu van nam ((loc va) or (thuc va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ly) OR (sach lo)) nang xa hoi. hieu van nam ((loc va) OR (thuc va)) hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: te ((sach ly) or (sach lo)) nang xa hoi. hieu van nam ((loc va) or (thuc va)) hanh va cua te*.