Perhaps you should try some spelling variations:
duoc tuc » duoc tu, duoc muc, duoc duoc
su sach » so sach, vu sach
va tinh » may tinh
ca tinh » cua tinh, cac tinh, ha tinh
hieu ve » hieu va, hieu van
ve duoc » te duoc, ve nuoc, che duoc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
su xac » pu xac, su cac
va cua » va chua, via cua, ca 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) or (su xac)) ky lang xa hoi. hieu ve duoc tuc ((ca tinh) or (va tinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (su xac)) ky lang xa hoi. hieu ve duoc tuc ((ca tinh) OR (va tinh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (su xac)) ky lang xa hoi. hieu ve duoc tuc ((ca tinh) or (va tinh)) va cua tre*.