Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cua tre » cua te, cuu tre, cua triet
xa dung » xay dung, xa dong, va dung
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 ty ((nang ma) or (nang x)) hoi. hieu va cam tuc xa dung tai ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (nang x)) hoi. hieu va cam tuc xa dung tai ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (nang x)) hoi. hieu va cam tuc xa dung tai ((cua tre) or (cau tren))*.