Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lang mai » lang dai, lang hai, lang man
sang tai » hang tai, sang tao, tang tai
tai cuu » tai buu, tai cua, thai cua
va hang » van hang, va nang, va lang
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va

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 ky ((lang mai) or (sang tai)) hoi. hieu ve cac xuc va hang ((tai cuu) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang mai) OR (sang tai)) hoi. hieu ve cac xuc va hang ((tai cuu) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang mai) or (sang tai)) hoi. hieu ve cac xuc va hang ((tai cuu) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang mai) or (sang tai)) hoi. hieu ve cac xuc va hang ((tai cuu) OR (tai cuc)) tre*.