Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
cua viet » hoa viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
ca viet » co viet, hoa viet, san viet
va viet » hoa viet, san viet, mai viet
ve cac » va cac, vien cac
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 ky nang x hoi. hieu ve cac duc tan thanh san ((cua viet) or (((ca viet) OR (va viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve cac duc tan thanh san ((cua viet) OR (((ca viet) OR (va viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ve cac duc tan thanh san ((cua viet) or (((ca viet) OR (va viet))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve cac duc tan thanh san ((cua viet) or (((ca viet) OR (va viet))))*.