Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
khang va » hang va, thang va, khang a
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
tuc van » truc van, tuc va, duc van
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: tu sach y nang xa hoi. ((hieu ve) or (hieu va)) cam ((tuc van) OR (thuc van)) khang va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc van) OR (thuc van)) khang va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu ve) or (hieu va)) cam ((tuc van) OR (thuc van)) khang va su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu ve) or (hieu va)) cam ((tuc van) OR (thuc van)) khang va su triet*.