Perhaps you should try some spelling variations:
thien van » thi van
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
y dang » 2 dang, _ dang, b dang
bac va » ban va, bac ha, bao va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y dang) OR (ky dang)) ha hoi. thien van cam ((bac va) or (truc va)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y dang) OR (ky dang)) ha hoi. thien van cam ((bac va) OR (truc va)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y dang) OR (ky dang)) ha hoi. thien van cam ((bac va) or (truc va)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y dang) OR (ky dang)) ha hoi. thien van cam ((bac va) or (truc va)) thanh di cua tre*.