Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
su viet » so viet
y nang » ky nang, ly nang, v nang

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) or (thu sach)) y nang ma hoa. ((hieu ve) or (lieu va)) cam duc va hanh va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ma hoa. ((hieu ve) OR (lieu va)) cam duc va hanh va su viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang ma hoa. ((hieu ve) or (lieu va)) cam duc va hanh va su viet*.