Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac xuc » cac nuoc, chat xuc, cac cuoc
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
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 nang ma hoi. ((hieu vien) OR (thieu nien)) ((cac xuc) or (cam xuc)) va hanh vi cua 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)) ((cac xuc) OR (cam xuc)) va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. ((hieu vien) OR (thieu nien)) ((cac xuc) or (cam xuc)) va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. ((hieu vien) OR (thieu nien)) ((cac xuc) or (cam xuc)) va hanh vi cua viet*.