Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
van lam » van nam
nang ho » nang hoc, nang co, tang ho
ho hai » hoc hai, pho hai, cho hai
tuc va » truc va, tuc xa, duc va
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: ((te sach) or (thuoc sach)) ky nang ho hai. hieu van lam ((tuc va) OR (thuc va)) danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky nang ho hai. hieu van lam ((tuc va) OR (thuc va)) danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky nang ho hai. hieu van lam ((tuc va) OR (thuc va)) danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky nang ho hai. hieu van lam ((tuc va) OR (thuc va)) danh dai cua te*.