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 tai » hang tai, tang tai, sang tai
tai hoi » tai khoi, dai hoi, tai hai
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
tu sach » thu sach, su sach, tu cach
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) OR (te sach)) ty nang tai 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) OR (te sach)) ty nang tai 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) OR (te sach)) ty nang tai hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty nang tai hoi. hieu hien ((cap nuoc) or (cam xuc)) van hanh vi cua viet*.