Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
thai tuc » thai thuc, thai thuy, thai hoc
van thai » van thoai, van tai, van hai
nang xa » lang xa, nang ma, mang xa
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
tuc va » thuc va, truc va, tuc xa

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 ly ((nang xa) OR (nang x)) hoi. thien van thai tuc va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang xa) OR (nang x)) hoi. thien van thai tuc va hanh vi ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((nang xa) OR (nang x)) hoi. thien van thai tuc va hanh vi ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang xa) OR (nang x)) hoi. thien van thai tuc va hanh vi ((cua tre) or (cau tren))*.