Perhaps you should try some spelling variations:
chua viet » chuan viet, cua viet, chu viet
hieu vien » hieu hien, hieu viec, thieu nien
vien cam » vien cac, vien cao, vien nam
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
va hanh » va thanh, va danh, ban hanh
va chua » vua chua, ca chua, va chu
tu sach » thu sach, te sach, tu cach
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) or (su sach)) ty nang ma hoi. hieu vien cam xuc ((va hanh) OR (van hanh)) va chua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang ma hoi. hieu vien cam xuc ((va hanh) OR (van hanh)) va chua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty nang ma hoi. hieu vien cam xuc ((va hanh) OR (van hanh)) va chua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang ma hoi. hieu vien cam xuc ((va hanh) OR (van hanh)) va chua viet*.