Perhaps you should try some spelling variations:
thien van » thi van
van thanh » ban thanh, van tuan
van pham » san pham, van phan, van phat
dinh cuu » dinh chi
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
y nang » ly nang, v nang, may nang
di cuu » di cau, di 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 ((y nang) OR (ky nang)) xa hoi. thien van pham duc van thanh ((di cuu) or (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. thien van pham duc van thanh ((di cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) xa hoi. thien van pham duc van thanh ((di cuu) or (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) xa hoi. thien van pham duc van thanh ((di cuu) or (dinh cuu)) tre*.