Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ky » sac ky, sach y, sach ty
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 ky nang ma hoi. hieu va chat truc ((va hanh) or (va danh)) dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu va chat truc ((va hanh) OR (va danh)) dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu va chat truc ((va hanh) or (va danh)) dai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu va chat truc ((va hanh) or (va danh)) dai ((cua tre) OR (cua te))*.