Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luoc van » luoc can, luoc va, luot van
nang xa » lang xa, nang ma, mang xa
luc van » luu van, duc van, luc va
cu tren » tu tren, dua tren
va cam » va cham, va cac, va cao
vi cu » vi su, vi xu, vi du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) or (nang x)) hoi. lieu va cam ((luc van) OR (luoc van)) hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang x)) hoi. lieu va cam ((luc van) OR (luoc van)) hanh vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang x)) hoi. lieu va cam ((luc van) OR (luoc van)) hanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang x)) hoi. lieu va cam ((luc van) OR (luoc van)) hanh vi cu tren*.