Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang tai » hang tai, tang tai, sang tai
cao tang » cao dang
tai cua » thai cua, tai cuc, tri cua
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
tuc va » thuc va, truc va, duc va
cua te » cua tu

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 ((kho tang) or (cao tang)) ma hoa. hieu ve cac ((tuc va) OR (tuc xa)) nang tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((kho tang) OR (cao tang)) ma hoa. hieu ve cac ((tuc va) OR (tuc xa)) nang tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((kho tang) or (cao tang)) ma hoa. hieu ve cac ((tuc va) OR (tuc xa)) nang tai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((kho tang) or (cao tang)) ma hoa. hieu ve cac ((tuc va) OR (tuc xa)) nang tai cua te*.