Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
xa dung » xay dung, xa dong, va dung
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
sach tu » sach thu, cach tu, sach ty
su sach » so sach, vu sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu ((nang ma) OR (sang ma)) hoi. hieu van cam tuc xa dung tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu ((nang ma) OR (sang ma)) hoi. hieu van cam tuc xa dung tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu ((nang ma) OR (sang ma)) hoi. hieu van cam tuc xa dung tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach tu ((nang ma) OR (sang ma)) hoi. hieu van cam tuc xa dung tai ((cua tre) or (cuu tre))*.