Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vat hanh » vat thanh, van hanh, va hanh
hanh va » hanh vi
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
hang ca » nang cao, hang tai, hang dau
sach ly » sach y, sach lo, sach ty
su hien » su kien, su tien, thu hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ly ((hang ca) or (hang va)) hoi. hieu ((ve cham) OR (va cham)) thuc vat hanh va su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ly ((hang ca) OR (hang va)) hoi. hieu ((ve cham) OR (va cham)) thuc vat hanh va su hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ly ((hang ca) or (hang va)) hoi. hieu ((ve cham) OR (va cham)) thuc vat hanh va su hien".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ly ((hang ca) or (hang va)) hoi. hieu ((ve cham) OR (va cham)) thuc vat hanh va su hien*.