Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
dua tren » dung tren
manh han » manh hai, manh hon, anh han
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
han tai » hang tai, nhan tai, van tai
van bao » van ban, van dao
bao duc » dao duc, bao luc, cao duc
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. hieu van bao duc manh han tai ((dua tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) xa hoi. hieu van bao duc manh han tai ((dua tren) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) xa hoi. hieu van bao duc manh han tai ((dua tren) or (cua te))*.