Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
hanh xa » hanh va, hanh ma, hanh xu
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hanh xa hoi. hieu ((ve nam) OR (le nam)) thuc va hanh kem ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thi hanh xa hoi. hieu ((ve nam) OR (le nam)) thuc va hanh kem ((cua te) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: toc sach thi hanh xa hoi. hieu ((ve nam) OR (le nam)) thuc va hanh kem ((cua te) or (cua tu))*.