Perhaps you should try some spelling variations:
nhan luc » nang luc
luc tuan » luc luan, luc quan, luu tuan
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
nang o » nang co, nang ho, nang ro
ve cua » le cua, de cua, ve cum
te cua » tue cua, le cua, de cua
o hoi » co hoi, o hoc, o hai

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) or (te sach)) ky nang o hoi. hieu va nhan luc tuan anh ((ve cua) OR (te cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang o hoi. hieu va nhan luc tuan anh ((ve cua) OR (te cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang o hoi. hieu va nhan luc tuan anh ((ve cua) OR (te cua)) vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang o hoi. hieu va nhan luc tuan anh ((ve cua) OR (te cua)) vat*.