Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh le » thinh le, thanh ve, thanh de
luu van » cuu van, luan van, luu hanh
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
luc van » luoc van, duc van, luc va
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
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 cam ((luc van) or (luu van)) thanh le ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va cam ((luc van) OR (luu van)) thanh le ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va cam ((luc van) or (luu van)) thanh le ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va cam ((luc van) or (luu van)) thanh le ((cua tre) OR (cua triet))*.