Perhaps you should try some spelling variations:
luat duoc » luat tuc
thanh ha » thanh hoa, thanh hai, nhanh ha
thanh va » thanh van, hanh va, thanh ve
trang xa » trang va, trang ha, trong xa
duoc va » nuoc va, duc va, duoc ma
su sach » so sach, vu sach
va luat » va thuat, vay luan, cua luat
hieu va » lieu va, hieu qua
tang xa » tang ma, lang xa, tang ha
cua tre » cua te, cuu tre, cua triet

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 y ((tang xa) or (trang xa)) hoi. hieu va luat duoc va ((thanh va) OR (thanh ha)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((tang xa) OR (trang xa)) hoi. hieu va luat duoc va ((thanh va) OR (thanh ha)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((tang xa) or (trang xa)) hoi. hieu va luat duoc va ((thanh va) OR (thanh ha)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((tang xa) or (trang xa)) hoi. hieu va luat duoc va ((thanh va) OR (thanh ha)) cua tre*.