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

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