Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
lang van » dang van, tang van, hoang van
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay
sach ky » sac ky, sach y, sach kem
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: vu ((sach ky) or (sach ty)) ((lang xa) or (lang van)) hoi. thien van nam thuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach ty)) ((lang xa) OR (lang van)) hoi. thien van nam thuc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) or (sach ty)) ((lang xa) or (lang van)) hoi. thien van nam thuc va hanh vi cua vat*.