Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
tang mam » dang mam, mang mam, tang dam
cac truc » cau truc, cac tru, cac trung
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
cuc tre » duc tre, cua tre, cuu tre
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: thu sach ky ((tang ma) or (tang mam)) hoi. hieu ve cac truc va ((hanh tai) or (doanh tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((tang ma) OR (tang mam)) hoi. hieu ve cac truc va ((hanh tai) OR (doanh tai)) cuc tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((tang ma) or (tang mam)) hoi. hieu ve cac truc va ((hanh tai) or (doanh tai)) cuc tre*.