Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh dau » lanh dao, hang dau, danh tu
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
tuc va » thuc va, truc va, tuc xa

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 lang xa hoi. hieu van cac ((tuc va) or (thuc vat)) danh dau ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang xa hoi. hieu van cac ((tuc va) OR (thuc vat)) danh dau ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu van cac ((tuc va) or (thuc vat)) danh dau ((cua tre) or (cuu tre))*.