Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
trinh dai » trinh tai, trinh di, trinh da
nang mai » nang ma, nang tai, lang mai
tinh dai » tinh da, tinh hai, tinh doi
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va

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