Perhaps you should try some spelling variations:
tuan thai » xuan thai, tuan khai, tuan tai
thai cua » than cua, tai cuc, tri cua
van tuan » van quan, van ban, anh tuan
cua tre » cua te, cuu tre, cua triet
danh xa » danh ca, dinh xa, canh xa
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hai ky » thai ky, hoi ky, sai ky
hai ly » dai ly

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((hai ky) OR (hai ly)) danh xa hoi. ((hieu ve) or (hieu qua)) cam duc van tuan thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((hai ky) OR (hai ly)) danh xa hoi. ((hieu ve) OR (hieu qua)) cam duc van tuan thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((hai ky) OR (hai ly)) danh xa hoi. ((hieu ve) or (hieu qua)) cam duc van tuan thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((hai ky) OR (hai ly)) danh xa hoi. ((hieu ve) or (hieu qua)) cam duc van tuan thai cua tre*.