Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
danh dai » danh dau, danh di, vanh dai
van cham » van chat, van tham, va cham
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach y, sach vay
soc va » hoc va, loc va, doc va
sach 2 » sach y

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) or (sach 2)) nang ma hoi. hieu van cham soc va ((danh dai) OR (danh sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach 2)) nang ma hoi. hieu van cham soc va ((danh dai) OR (danh sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach 2)) nang ma hoi. hieu van cham soc va ((danh dai) OR (danh sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach 2)) nang ma hoi. hieu van cham soc va ((danh dai) OR (danh sai)) cua tre*.