Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, va cam
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: su sach van ((nang ma) or (lang xa)) hoi. hieu ((ve cam) or (va cham)) thuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van ((nang ma) OR (lang xa)) hoi. hieu ((ve cam) OR (va cham)) thuc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach van ((nang ma) or (lang xa)) hoi. hieu ((ve cam) or (va cham)) thuc va hanh vi cua vat*.