Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
ty hoang » ty hang, huy hoang, thi hoang
hoang xa » hoang ha, hoang va, hoang xuan
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
sach ty » sach y, sach tu, sach thu
vi cuu » vinh cuu
vi luu » vi lua

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 hoang xa hoi. ((hieu quan) or (hieu qua)) cam luc van hanh ((vi cuu) OR (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hoang xa hoi. ((hieu quan) OR (hieu qua)) cam luc van hanh ((vi cuu) OR (vi luu)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hoang xa hoi. ((hieu quan) or (hieu qua)) cam luc van hanh ((vi cuu) OR (vi luu)) tre*".