Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tang ma » mang may, tang van
hang ma » hang va, hang ca, nang ma
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, tuc xa, duc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((hang ma) or (tang ma)) hoi. hieu va cham ((tuc va) OR (thuc va)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((hang ma) OR (tang ma)) hoi. hieu va cham ((tuc va) OR (thuc va)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((hang ma) or (tang ma)) hoi. hieu va cham ((tuc va) OR (thuc va)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((hang ma) or (tang ma)) hoi. hieu va cham ((tuc va) OR (thuc va)) thanh vi cua tre*.