Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
cua viet » ca viet, hoa viet, cua vat
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach y, sach thu, xach tay
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc 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: tu ((sach ty) or (sach tu)) nang ma hoi. ((hieu vien) OR (hieu viec)) cac xuc va danh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang ma hoi. ((hieu vien) OR (hieu viec)) cac xuc va danh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) nang ma hoi. ((hieu vien) OR (hieu viec)) cac xuc va danh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang ma hoi. ((hieu vien) OR (hieu viec)) cac xuc va danh vi cua viet*.