Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh tai » thanh tai, hang tai, han tai
danh tai » doanh tai, dinh tai, anh tai
cac xuc » cam xuc, cac nuoc, chat xuc
cuc tre » duc tre, cua tre, cuu tre
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
xuc va » duc va, tuc va, luc va
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ky sang) or (ky tang)) ma hoa. hieu ve cac xuc va ((danh tai) OR (hanh tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky sang) OR (ky tang)) ma hoa. hieu ve cac xuc va ((danh tai) OR (hanh tai)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky sang) or (ky tang)) ma hoa. hieu ve cac xuc va ((danh tai) OR (hanh tai)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky sang) or (ky tang)) ma hoa. hieu ve cac xuc va ((danh tai) OR (hanh tai)) cuc tre*.