Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
cac xuc » cac nuoc, chat xuc, cac cuoc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de 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 di 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 di 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 di cua viet*.