Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang mai » nang ma, nang tai, lang mai
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va
cac tuc » cac toc, cac tu, cac tac
va tinh » may tinh
hoi cua » hoi chuc
y nang » ky nang, ly nang, v nang

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 mai hoi. ((hieu va) OR (hieu qua)) cac tuc ((va tinh) or (gia thanh)) hoi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang mai hoi. ((hieu va) OR (hieu qua)) cac tuc ((va tinh) OR (gia thanh)) hoi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang mai hoi. ((hieu va) OR (hieu qua)) cac tuc ((va tinh) or (gia thanh)) hoi cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach y nang mai hoi. ((hieu va) OR (hieu qua)) cac tuc ((va tinh) or (gia thanh)) hoi cua triet*.