Perhaps you should try some spelling variations:
sach nham » sach nha, sach tham, sach han
cau tren » cu tren, dau tren, ca tren
su triet » su viet, su tien, ve triet
xa dung » xay dung, xa dong, va dung
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 nham ((nang ma) OR (nang cao)) hoi. hieu ve cam tuc xa dung tai ((su triet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach nham ((nang ma) OR (nang cao)) hoi. hieu ve cam tuc xa dung tai ((su triet) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach nham ((nang ma) OR (nang cao)) hoi. hieu ve cam tuc xa dung tai ((su triet) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach nham ((nang ma) OR (nang cao)) hoi. hieu ve cam tuc xa dung tai ((su triet) or (cau tren))*.