Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
thuoc va » thuc va, thuoc ma, thuong va
manh hai » lanh hai, minh hai, thanh hai
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va manh » van manh, va danh, va hanh
ma hoi » mai hoi, xa hoi, me hoi
va lam » van lam, va lap
hai su » hai vu, lai su, hai so

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ly nang ((ma hoi) or (ma hoa)). hieu va lam thuoc va manh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang ((ma hoi) OR (ma hoa)). hieu va lam thuoc va manh hai su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ly nang ((ma hoi) or (ma hoa)). hieu va lam thuoc va manh hai su triet*.