Perhaps you should try some spelling variations:
lanh manh » lanh tranh, lan anh, van manh
hanh manh » hanh mang, hoang manh, thanh minh
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
vai ca » vai cac, vai cua, vai va
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: thu sach ky nang x hoi. hieu va nam thuc ((hanh manh) or (lanh manh)) ((vai ca) OR (bai ca)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu va nam thuc ((hanh manh) OR (lanh manh)) ((vai ca) OR (bai ca)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu va nam thuc ((hanh manh) or (lanh manh)) ((vai ca) OR (bai ca)) viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu va nam thuc ((hanh manh) or (lanh manh)) ((vai ca) OR (bai ca)) viet*.