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