Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
cua cuu » cua chu, cua cau, cua cu
va tinh » may tinh
truc va » thuc va, thuc vat, trung va
sach ty » sach y, sach thu, xach tay
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
ma hoi » mai hoi, xa hoi, ma hoa
ca cuu » cap cuu, ca cua, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach tu)) nang ma hoi. hieu va cac truc va tinh ((ca cuu) or (cua cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang ma hoi. hieu va cac truc va tinh ((ca cuu) OR (cua cuu)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang ma hoi. hieu va cac truc va tinh ((ca cuu) or (cua cuu)) tre*".