Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh va » hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
su tien » su kien, su hien, tu tieng
hang ca » nang cao, hang tai, hang dau
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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 ((hang ca) or (hang va)) hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((hang ca) OR (hang va)) hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh va su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((hang ca) or (hang va)) hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh va su tien".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((hang ca) or (hang va)) hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh va su tien*.