Perhaps you should try some spelling variations:
di truyen » co truyen
ve triet » va trien, su triet
hanh dai » hanh tai, hanh dao, vanh dai
truc va » thuc va, thuc vat, trung va
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
tuc va » thuc va, tuc xa, duc va
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang cao hoi. hieu ve cam ((tuc va) OR (truc va)) hanh dai ((ve triet) or (di truyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang cao hoi. hieu ve cam ((tuc va) OR (truc va)) hanh dai ((ve triet) OR (di truyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang cao hoi. hieu ve cam ((tuc va) OR (truc va)) hanh dai ((ve triet) or (di truyen))".
• Adding a wildcard symbol may retrieve word variants: so sach v nang cao hoi. hieu ve cam ((tuc va) OR (truc va)) hanh dai ((ve triet) or (di truyen))*.