Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
soc manh » suc manh, ho manh, duc manh
hanh lai » hanh lam, thanh lap, thanh loi
hanh tai » thanh tai, hang tai, han tai
cam viet » cham viet, ca viet, cao viet
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
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 manh ((hanh lai) or (hanh tai)) 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 manh ((hanh lai) OR (hanh tai)) 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 manh ((hanh lai) or (hanh tai)) cam viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ky nang)) x hoi. hieu van cham soc manh ((hanh lai) or (hanh tai)) cam viet*.