Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cau phuc » cau truc, chau phu, huu phuc
tinh dai » trinh dai, tinh da, tinh hai
tu sach » thu sach, su sach, te sach
nang co » nang cao, nang doc, nang noi
co hoat » cao hoat, cac hoat, che hoat
hieu va » lieu va, hieu qua
phuc va » phuc vu, thuc va, chuc va
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
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 y nang co hoat. ((hieu van) or (hieu va)) cau phuc va tinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang co hoat. ((hieu van) OR (hieu va)) cau phuc va tinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang co hoat. ((hieu van) or (hieu va)) cau phuc va tinh dai cua tre*.