Perhaps you should try some spelling variations:
xang van » dang van, tang van, nang van
lang van » dang van, tang van, hoang van
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cau loc » hau loc, cau hoc, cau luc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ve cau » ke cau, va cau, ve cac
loc va » hoc va, luc va
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: so sach ty ((xang van) or (lang van)) hoe. hieu ve cau loc va danh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((xang van) OR (lang van)) hoe. hieu ve cau loc va danh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((xang van) or (lang van)) hoe. hieu ve cau loc va danh vi cua viet*.