Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
thanh vi » hanh vi, thanh va, thanh ve
sach thu » sach thue, sach thieu, sach tham
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
ve cham » va cham, ve chat, vu cham
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
vi va » vi van, vai va, vu va

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 thu ((nang x) or (sang ma)) hoi. hieu ve cham ((soc va) OR (loc va)) thanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((nang x) OR (sang ma)) hoi. hieu ve cham ((soc va) OR (loc va)) thanh vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((nang x) or (sang ma)) hoi. hieu ve cham ((soc va) OR (loc va)) thanh vi va trien".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((nang x) or (sang ma)) hoi. hieu ve cham ((soc va) OR (loc va)) thanh vi va trien*.