Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
soc xanh » hoc xanh, song xanh, tuoc xanh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » su sach, te sach, tu cach
ty nang » ty xang, ty hang, ly nang
ca viet » va viet, co viet, hoa viet
lai ca » lai cua, lai cam, loai ca
x hoi » xa hoi, o hoi, x ho

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 (thu sach)) ((ty nang) or (ky nang)) x hoi. hieu van cham soc xanh hanh lai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((ty nang) OR (ky nang)) x hoi. hieu van cham soc xanh hanh lai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ((ty nang) or (ky nang)) x hoi. hieu van cham soc xanh hanh lai ca viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ((ty nang) or (ky nang)) x hoi. hieu van cham soc xanh hanh lai ca viet*.