Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hoang xa » hoang ha, hoang va, hoang xuan
sach thi » sach thu, sach tai, sach thieu
thuoc va » thuc va, thuoc ma, thuong va
hanh vai » hanh vi, hanh tai, hanh van
su sach » so sach, vu sach
hang xa » hang va, hang ca, lang xa
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay

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