Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
dang hai » dang khai, hang hai, dung hai
danh hai » lanh hai, manh hai, danh hau
van dau » van dao, phan dau
su sach » vu sach
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
dau tuc » dau tu, dao tuc, cau truc
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

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) or (so sach)) y nang xa hoi. thien van dau tuc va ((danh hai) OR (dang hai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang xa hoi. thien van dau tuc va ((danh hai) OR (dang hai)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang xa hoi. thien van dau tuc va ((danh hai) OR (dang hai)) su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. thien van dau tuc va ((danh hai) OR (dang hai)) su triet*.