Perhaps you should try some spelling variations:
nang doc » nang luc
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
doc loi » duc loi
tai cua » thai cua, tai cuc, tri cua
xuc va » tuc va, xac va
luc 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 ky nang doc loi. hieu van nam ((((xuc va) OR (luc va))) or (duc va)) doanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang doc loi. hieu van nam ((((xuc va) OR (luc va))) OR (duc va)) doanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang doc loi. hieu van nam ((((xuc va) OR (luc va))) or (duc va)) doanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang doc loi. hieu van nam ((((xuc va) OR (luc va))) or (duc va)) doanh tai cua te*.