Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dau truc » cau truc, dai truc, doan truc
dua tren » dung tren
hanh lam » thanh lap, hanh kem, hanh va
cua tre » cua te, cuu tre, cua thep
te sach » toc sach
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va dau » va dao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ma hoi. hieu va dau truc va hanh lam ((((cua tre) OR (dua tren))) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va dau truc va hanh lam ((((cua tre) OR (dua tren))) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va dau truc va hanh lam ((((cua tre) OR (dua tren))) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va dau truc va hanh lam ((((cua tre) OR (dua tren))) or (cua triet))*.