Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
va hanh » van hanh, va danh, ban hanh
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
cac tu » cac thu, cach tu, cac du
vi cua » vai cua, di cua
ve cac » va cac, vien cac

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 ly ((nang xa) OR (lang xa)) hoi. hieu ve cac tu ((va hanh) or (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang xa) OR (lang xa)) hoi. hieu ve cac tu ((va hanh) OR (va thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((nang xa) OR (lang xa)) hoi. hieu ve cac tu ((va hanh) or (va thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang xa) OR (lang xa)) hoi. hieu ve cac tu ((va hanh) or (va thanh)) vi cua tre*.