Perhaps you should try some spelling variations:
cau phuc » cau truc, chau phu, huu phuc
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
phuc va » phuc vu, thuc va, chuc va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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 (te sach)) y nang ma hoa. ((hieu ve) or (hieu va)) cau phuc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ma hoa. ((hieu ve) OR (hieu va)) cau phuc va tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y nang ma hoa. ((hieu ve) or (hieu va)) cau phuc va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y nang ma hoa. ((hieu ve) or (hieu va)) cau phuc va tinh di cua tre*.