Perhaps you should try some spelling variations:
thuc van » thuc dan, thuc va, thuc hanh
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
vi va » vi van, vai va, vu 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 sac ky dang xa hoi. hieu ve nam ((thuc van) OR (thuc vat)) hanh ((vi va) or (mai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. hieu ve nam ((thuc van) OR (thuc vat)) hanh ((vi va) OR (mai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xa hoi. hieu ve nam ((thuc van) OR (thuc vat)) hanh ((vi va) or (mai va)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. hieu ve nam ((thuc van) OR (thuc vat)) hanh ((vi va) or (mai va)) triet*.