Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh van » thanh san, thanh toan, thanh nhan
chat duc » chat xuc, chat doc, chet duoc
ky nganh » ky nang, ly ngan, da nganh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xay hoi » xa hoi, tay hoi, cay phoi
huy tre » huy tri, luy tre, huy tran
k ngan » kim ngan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky nganh) OR (k ngan)) xay hoi. hieu ve chat duc va ((thanh van) or (thanh phan)) huy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky nganh) OR (k ngan)) xay hoi. hieu ve chat duc va ((thanh van) OR (thanh phan)) huy tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky nganh) OR (k ngan)) xay hoi. hieu ve chat duc va ((thanh van) or (thanh phan)) huy tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky nganh) OR (k ngan)) xay hoi. hieu ve chat duc va ((thanh van) or (thanh phan)) huy tre*.