Perhaps you should try some spelling variations:
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
cac thoi » cac toi, cac hop, cac tro
sach doi » sach hoi, sach moi, sach dao
thoi gia » thoi gian, hoi gia, thoi gio
thanh vi » hanh vi, thanh va, thanh ve
doi nang » dai nang, hoi nang, voi nang
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ca tren » cau tren, cu tren, co tren
la tren » loai tren, dua tren, dat tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach doi nang xa hoi. thien van cac thoi gia thanh vi ((cua tre) or (((ca tren) or (la tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach doi nang xa hoi. thien van cac thoi gia thanh vi ((cua tre) OR (((ca tren) OR (la tren)))).
• Adding a wildcard symbol may retrieve word variants: hoc sach doi nang xa hoi. thien van cac thoi gia thanh vi ((cua tre) or (((ca tren) or (la tren))))*.