Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
tu trong » tu tuong, tu tieng
va thanh » gia thanh, ban thanh, va tinh
cham cuu » cap cuu, chat cua
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach ty
tu tren » tu truyen, tu tieng, dua tren
sac ky » cac ky, sai ky
cuu va » cuu van, cuu ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach tu)) lang xa hoi. hieu van cham cuu va thanh phan ((tu tren) OR (tu trong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach tu)) lang xa hoi. hieu van cham cuu va thanh phan ((tu tren) OR (tu trong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sach tu)) lang xa hoi. hieu van cham cuu va thanh phan ((tu tren) OR (tu trong))".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach tu)) lang xa hoi. hieu van cham cuu va thanh phan ((tu tren) OR (tu trong))*.