Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
va triet » va trien, ve triet, cua triet
cam truc » cau truc, nam truc, lam truoc
hanh va » hanh vi
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
hanh xa » hanh ma, hanh xu, canh xa
va cam » va cham, va cac, va cao
thiet » thieu

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