Perhaps you should try some spelling variations:
tru nang » tri nang, truc nano, thi nang
tra nang » thi nang, kha nang, da nang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
danh va » doanh va, hanh va, anh va
cao luc » bao luc, cao duc, cao suc
van cao » van dao, van bao, van hao
luc va » duc va, tuc va, loc va
cua te » cua tu

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 ((tru nang) or (tra nang)) xa hoi. hieu van cao luc va ((danh va) or (hang va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (tra nang)) xa hoi. hieu van cao luc va ((danh va) OR (hang va)) cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (tra nang)) xa hoi. hieu van cao luc va ((danh va) or (hang va)) cua te*.