Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach tham
nam thuc » nam thuoc, am thuc, nam thu
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
va nam » van nam, ha nam, va nay
vi 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 thi) or (sach thieu)) hang xa hoi. hieu va nam thuc va hanh ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach thieu)) hang xa hoi. hieu va nam thuc va hanh ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach thieu)) hang xa hoi. hieu va nam thuc va hanh ((vi cua) or (vai cua)) viet*.