Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hai » van ha, van chat, van hanh
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dan bac » dan ba, van bac, dong bac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
van hac » van hoc, van ha, van chat
di ve » dai ve, de ve, do ve

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 ky lang xa hoi. hieu ((dan bac) or (((van hac) OR (van hai)))) truc va danh di ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ((dan bac) OR (((van hac) OR (van hai)))) truc va danh di ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu ((dan bac) or (((van hac) OR (van hai)))) truc va danh di ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ((dan bac) or (((van hac) OR (van hai)))) truc va danh di ve triet*.