Perhaps you should try some spelling variations:
nguoi quan » nguoi san, nguoi dan
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
xuc san » xuc ban, luc sang, nuoc san
benh vi » benh va, benh ve, benh li
sac ky » cac ky, sai ky
vi cau » va cau, ve cau, di cau

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 tu) or (sac ky)) nang xa hoi. hieu van nam ((xuc san) or (nguoi quan)) benh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sac ky)) nang xa hoi. hieu van nam ((xuc san) OR (nguoi quan)) benh vi cau treo.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sac ky)) nang xa hoi. hieu van nam ((xuc san) or (nguoi quan)) benh vi cau treo*.