Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh tai » doanh tai, dinh tai, hanh tai
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
cuc tre » duc tre, cua tre, cuu tre
y nang » ky nang, ly nang, v nang
tuc va » truc va, tuc xa, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. ((hieu ve) OR (hieu van)) chat ((tuc va) or (thuc va)) danh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu ve) OR (hieu van)) chat ((tuc va) OR (thuc va)) danh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu ve) OR (hieu van)) chat ((tuc va) or (thuc va)) danh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu ve) OR (hieu van)) chat ((tuc va) or (thuc va)) danh tai cuc tre*.