Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thi hanh » thi thanh
su sach » so sach, vu sach
hanh xa » hanh ma, hanh xu, canh xa
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
phat » phan, pham, phap

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) or (toc sach)) thi hanh xa hoi. hieu ve cam tuc va hanh va phat trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) thi hanh xa hoi. hieu ve cam tuc va hanh va phat trien.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) thi hanh xa hoi. hieu ve cam tuc va hanh va phat trien*.