Perhaps you should try some spelling variations:
tinh tai » trinh tai, tinh thai, tinh hai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
duoc va » nuoc va, duoc ma, duong va
cuc tre » duc tre, cua tre, cuu tre
su hoi » su choi, su hai, lu hoi
ve dat » de dat, va dat, ve dao

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) or (su sach)) ky dang su hoi. hieu ve dat ((duoc va) OR (duc va)) tinh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky dang su hoi. hieu ve dat ((duoc va) OR (duc va)) tinh tai cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky dang su hoi. hieu ve dat ((duoc va) OR (duc va)) tinh tai cuc tre*".