Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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 ty tang xa hoi. hieu ((ve cam) or (ve cac)) ((duc va) or (thuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang xa hoi. hieu ((ve cam) OR (ve cac)) ((duc va) OR (thuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang xa hoi. hieu ((ve cam) or (ve cac)) ((duc va) or (thuc va)) hanh vi cua tre*.