Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua dieu
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
van lam » van nam
sach ly » sach y, sach lo, sach ty
dinh di » dinh du, dinh vi, danh di
luc va » duc va, tuc va
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ly nang xa hoi. thien van lam ((luc va) OR (loc va)) dinh di ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang xa hoi. thien van lam ((luc va) OR (loc va)) dinh di ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ly nang xa hoi. thien van lam ((luc va) OR (loc va)) dinh di ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang xa hoi. thien van lam ((luc va) OR (loc va)) dinh di ((cua viet) or (cua vat))*.