Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi cua » vai cua
di cua » dai cua, doi cua, de 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 xa hoi. hieu ve cham thuc va hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van nang xa hoi. hieu ve cham thuc va hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach van nang xa hoi. hieu ve cham thuc va hanh ((vi cua) or (di cua)) tre*.