Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
cap nuoc » dat nuoc
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
sach ty » sach tu, sach thu, xach tay
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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 ty) OR (sach y)) nang ma hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ma hoi. hieu hien ((cap nuoc) OR (cam xuc)) van hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang ma hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang ma hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi cua viet*.