Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
xac va » tac va, ac va, bac va
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, va cam

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 ty ((nang xa) or (tang ma)) hoi. hieu ve cam ((xac va) or (thuc va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (tang ma)) hoi. hieu ve cam ((xac va) OR (thuc va)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (tang ma)) hoi. hieu ve cam ((xac va) or (thuc va)) hanh va cua tre*.