Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc van » thuc vat, thuc dan, thuc va
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
hanh dao » lanh dao, thanh dat, thanh dam
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
van cam » van nam, van lam, van cau
xay hoi » xa hoi, tay hoi, cay phoi
tu dang » thu dang, tu dong, su dang
tuc van » truc van, tuc va, duc van

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