Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dao » lanh dao, thanh dat, thanh dam
hieu van » hieu va, thien van, lieu va
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang ha » long ha
ty lang » tay lang, ty xang, ty hang
tuc va » thuc va, tuc xa, duc va
ha hoi » hoa hoi, ha noi, xa hoi

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 lang ha hoi. hieu van nam ((tuc va) or (truc va)) hanh dao ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang ha hoi. hieu van nam ((tuc va) OR (truc va)) hanh dao ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty lang ha hoi. hieu van nam ((tuc va) or (truc va)) hanh dao ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang ha hoi. hieu van nam ((tuc va) or (truc va)) hanh dao ((cua tre) OR (cua triet))*.