Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
sach thu » sach thue, sach thieu, sach tham
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
va chat » van chat, va phat, cao chat
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua te » cua tu

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) or (sach thu)) nang xa hoi. hieu va chat ((truc va) OR (thuc va)) danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach thu)) nang xa hoi. hieu va chat ((truc va) OR (thuc va)) danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach thu)) nang xa hoi. hieu va chat ((truc va) OR (thuc va)) danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach thu)) nang xa hoi. hieu va chat ((truc va) OR (thuc va)) danh dai cua te*.