Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
duc tuan » duc thuan, duc tan, duc toan
cham duc » pham duc, cham soc, pham duy
lai cua » dai cua, hai cua, lai chau
anh lai » anh bai, anh tai, gianh lai
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 thi nang ((o hoi) OR (o hai)). ((hieu ve) or (lieu va)) cham duc tuan anh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang ((o hoi) OR (o hai)). ((hieu ve) OR (lieu va)) cham duc tuan anh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang ((o hoi) OR (o hai)). ((hieu ve) or (lieu va)) cham duc tuan anh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang ((o hoi) OR (o hai)). ((hieu ve) or (lieu va)) cham duc tuan anh lai cua viet*.