Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
xuc va » tuc va, luc va, xac va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (tu sach)) y nang ma hoa. hieu va cac ((xuc va) or (duc va)) hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (tu sach)) y nang ma hoa. hieu va cac ((xuc va) OR (duc va)) hanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (tu sach)) y nang ma hoa. hieu va cac ((xuc va) or (duc va)) hanh hai cua tu*.