Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
cua viet » ca viet, cua vat, cua dieu
sach ty » sach y, sach tu, sach thu
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. ((hieu vien) or (thieu nien)) cam xuc va danh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. ((hieu vien) OR (thieu nien)) cam xuc va danh vi ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. ((hieu vien) or (thieu nien)) cam xuc va danh vi ((cua viet) or (hoa viet))*.