Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
cam viet » cham viet, cao viet, nam viet
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
ca viet » va viet, co viet, hoa viet
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 x hoi. hieu va cham duc manh ((hanh lai) or (hanh tai)) ((cam viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu va cham duc manh ((hanh lai) OR (hanh tai)) ((cam viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu va cham duc manh ((hanh lai) or (hanh tai)) ((cam viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu va cham duc manh ((hanh lai) or (hanh tai)) ((cam viet) OR (ca viet))*.