Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
nang mai » nang ma, nang tai, nang cai
cau theo » cau thi, cau tao
lang mai » lang dai, lang hai, lang man
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
xa lanh » va lanh, xa lach, nha lanh
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau

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 ky ((nang mai) OR (lang mai)) hoi. hieu van cam tuc xa lanh hai ((cau theo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang mai) OR (lang mai)) hoi. hieu van cam tuc xa lanh hai ((cau theo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang mai) OR (lang mai)) hoi. hieu van cam tuc xa lanh hai ((cau theo) or (cau triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang mai) OR (lang mai)) hoi. hieu van cam tuc xa lanh hai ((cau theo) or (cau triet))*.