Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
danh dau » lanh dao, hang dau, danh tu
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
nang xa » nang x, lang xa, nang ma
dau cua » dai cua, day cua, cau 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: thu sach ky nang xa hoi. hieu ((van chat) or (cao chat)) ((thuc va) OR (thuc dan)) danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((van chat) OR (cao chat)) ((thuc va) OR (thuc dan)) danh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ((van chat) or (cao chat)) ((thuc va) OR (thuc dan)) danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((van chat) or (cao chat)) ((thuc va) OR (thuc dan)) danh dau cua tre*.