Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
thuc day » thuc dan, thuc vat
van tham » van thanh, van tuan, van chat
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

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