Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
cac xuc » cac nuoc, chat xuc, cac cuoc
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
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 (thien nhien)) ((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 (thien nhien)) ((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 (thien nhien)) ((cac xuc) or (cam xuc)) va hanh vi cua viet*.