Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
tu sach » thu sach, te sach, tu cach
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
ca chat » cao chat, cac chat, va chat
hieu ca » hieu cac, hieu cua, hieu va
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
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: ((tu sach) or (su sach)) ky nang xa hoi. hieu ca chat ((truc va) OR (thuc va)) danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ca chat ((truc va) OR (thuc va)) danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu ca chat ((truc va) OR (thuc va)) danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu ca chat ((truc va) OR (thuc va)) danh dai cua tre*.