Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
duc ban » duc van, dua ban, duc man
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, dua tren
vu sach » vu bach, su sach, vu khach
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: vu sach ty nang ma hoi. hieu va cham ((duc ban) or (duc tan)) thanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. hieu va cham ((duc ban) OR (duc tan)) thanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang ma hoi. hieu va cham ((duc ban) or (duc tan)) thanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ma hoi. hieu va cham ((duc ban) or (duc tan)) thanh vi ((cua tre) OR (cua triet))*.