Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) thanh san ((su triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) thanh san ((su triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) thanh san ((su triet) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) thanh san ((su triet) or (va trien))*.