Perhaps you should try some spelling variations:
tran manh » tran minh, tran thanh, tran van
doan manh » doan minh, hoang manh, van manh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
dan manh » dang manh, van manh, day manh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
co viet » so viet, o viet, hoc 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: te sach ky nang x hoi. hieu van nam thuc ((dan manh) or (((doan manh) OR (tran manh)))) mai co viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu van nam thuc ((dan manh) OR (((doan manh) OR (tran manh)))) mai co viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu van nam thuc ((dan manh) or (((doan manh) OR (tran manh)))) mai co viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu van nam thuc ((dan manh) or (((doan manh) OR (tran manh)))) mai co viet*.