Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va dinh » van dinh, va tinh, vu dinh
va kinh » va tinh, qua kinh
su viet » so viet
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
dam tu » nam tu, cam tu, dam thuc
y nang » ky nang, ly nang, v nang
tam tu » nam tu, cam tu, tam thuc
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: hoc sach y nang ma hoi. hieu va ((dam tu) OR (tam tu)) ((va dinh) or (va kinh)) va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang ma hoi. hieu va ((dam tu) OR (tam tu)) ((va dinh) OR (va kinh)) va su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y nang ma hoi. hieu va ((dam tu) OR (tam tu)) ((va dinh) or (va kinh)) va su viet*".