Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hien cac » thien cac, vien cac, hieu cac
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
luc va » tuc va, loc va
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: thu ((sach ty) OR (sach y)) nang ma hoi. bieu hien cac ((duc va) or (luc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach y)) nang ma hoi. bieu hien cac ((duc va) OR (luc va)) hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) OR (sach y)) nang ma hoi. bieu hien cac ((duc va) or (luc va)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) OR (sach y)) nang ma hoi. bieu hien cac ((duc va) or (luc va)) hanh vi cua viet*.