Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
su sach » so sach
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
o lang » hoa lang, hoi lang
va cua » va chua, via cua, ca 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) OR (vu sach)) o lang xa hoi. hieu ve ((cham soc) or (nham thuc)) va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) o lang xa hoi. hieu ve ((cham soc) OR (nham thuc)) va danh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) o lang xa hoi. hieu ve ((cham soc) or (nham thuc)) va danh va cua tre*".