Perhaps you should try some spelling variations:
luc sang » lam sang, luc canh
duy sang » duy van, duy can, duy anh
hieu van » thien van, lieu va, hieu ve
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((luc sang) or (duy sang)) ma hoi. ((hieu van) or (hieu va)) am thuc day hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((luc sang) OR (duy sang)) ma hoi. ((hieu van) OR (hieu va)) am thuc day hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ((luc sang) or (duy sang)) ma hoi. ((hieu van) or (hieu va)) am thuc day hanh vi cua vat*.