Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
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: su sach ly ((nang xa) or (lang ha)) hoi. hieu ve cac du ((va hanh) or (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang xa) OR (lang ha)) hoi. hieu ve cac du ((va hanh) OR (va tinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang xa) or (lang ha)) hoi. hieu ve cac du ((va hanh) or (va tinh)) vi cua tre*.