Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
soc xanh » hoc xanh, song xanh, tuoc xanh
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
lai cam » lai nam, lai tam, lai chau
lai ca » lai cua, loai ca, bai 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 ((ty nang) or (ky nang)) x hoi. hieu van cham soc xanh hanh ((lai ca) OR (lai cam)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) x hoi. hieu van cham soc xanh hanh ((lai ca) OR (lai cam)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ky nang)) x hoi. hieu van cham soc xanh hanh ((lai ca) OR (lai cam)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) x hoi. hieu van cham soc xanh hanh ((lai ca) OR (lai cam)) viet*.