Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
cua te » cua tu

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 ma hoa. ((hieu van) or (hieu va)) cau luc va tinh di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoa. ((hieu van) OR (hieu va)) cau luc va tinh di ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoa. ((hieu van) or (hieu va)) cau luc va tinh di ((cua tre) or (cua te))*.