Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
thu sach » thuat sach, thuoc sach, thu hoach
chau phu » chau phi, chau au, chau tho
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
phu va » phuc va, phu la, phu da
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) y nang x ho. ((hieu van) or (hieu va)) chau phu va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang x ho. ((hieu van) OR (hieu va)) chau phu va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) y nang x ho. ((hieu van) or (hieu va)) chau phu va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) y nang x ho. ((hieu van) or (hieu va)) chau phu va hanh vi cuu tre*.