Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ra » nang ma, lang ra, nang va
nang ro » nang co, nang ho, nang rong
tuc va » truc va, tuc xa, 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: su sach ty ((nang ro) or (nang ra)) hoi. hieu va cham ((tuc va) OR (thuc va)) hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ro) OR (nang ra)) hoi. hieu va cham ((tuc va) OR (thuc va)) hanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang ro) or (nang ra)) hoi. hieu va cham ((tuc va) OR (thuc va)) hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ro) or (nang ra)) hoi. hieu va cham ((tuc va) OR (thuc va)) hanh tai cua te*.