Perhaps you should try some spelling variations:
thien van » thi van
danh hai » dang hai, lanh hai, manh hai
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
nang xa » lang xa, nang ma, mang xa
van dau » van dao, phan dau
dau tuc » dau tu, dao tuc, cau truc
va danh » va dinh, va dan, va hanh
su sach » vu sach
tuc va » thuc va, truc va, tuc xa
hai su » hai vu, lai su, hai so

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