Perhaps you should try some spelling variations:
thuoc vat » thuc vat, thuoc va, thuoc bat
nam thuoc » nam thuc, nam thu, nha thuoc
vat hanh » vat thanh, van hanh, va hanh
hieu van » thien van, lieu va, hieu ve
sach doi » sach hoi, sach moi, sach dao
nang ma » tang ma, sang ma, nang cao
sach lo » sach dao, sach hoi, sach moi
hieu va » lieu va, hieu qua
va viet » hoa viet, san viet, mai viet
ma hoi » mai hoi, xa hoi, ma hoa
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: thu ((sach lo) OR (sach doi)) nang ma hoi. ((hieu van) or (hieu va)) nam thuoc vat hanh vi va viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach lo) OR (sach doi)) nang ma hoi. ((hieu van) OR (hieu va)) nam thuoc vat hanh vi va viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach lo) OR (sach doi)) nang ma hoi. ((hieu van) or (hieu va)) nam thuoc vat hanh vi va viet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach lo) OR (sach doi)) nang ma hoi. ((hieu van) or (hieu va)) nam thuoc vat hanh vi va viet*.