Perhaps you should try some spelling variations:
sach tham » sach nha
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
sach thu » sach thue, sach thieu, cach thuc
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
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: vu ((sach ly) or (((sach thu) OR (sach tham)))) lang xa hoi. hieu ve cac nuoc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ly) OR (((sach thu) OR (sach tham)))) lang xa hoi. hieu ve cac nuoc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ly) or (((sach thu) OR (sach tham)))) lang xa hoi. hieu ve cac nuoc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ly) or (((sach thu) OR (sach tham)))) lang xa hoi. hieu ve cac nuoc van hanh vi cua tre*.