Perhaps you should try some spelling variations:
luc ngan » luc nganh, luat ngan, vu ngan
luc nhan » luc nhat, cu nhan, tue nhan
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va dao » ca dao

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 ty nang xa hoi. hieu van cam ((luc ngan) OR (luc nhan)) hang ((va dau) or (va dao)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cam ((luc ngan) OR (luc nhan)) hang ((va dau) OR (va dao)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van cam ((luc ngan) OR (luc nhan)) hang ((va dau) or (va dao)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cam ((luc ngan) OR (luc nhan)) hang ((va dau) or (va dao)) tren*.