Perhaps you should try some spelling variations:
nam truoc » nam thuoc, lam truoc, nam truong
nam truc » nam thuc, nam trung, nam thuoc
cao hoc » co hoc, cho hoc, chat hoc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sach y)) nang cao hoc. lieu va ((nam truc) OR (nam truoc)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach y)) nang cao hoc. lieu va ((nam truc) OR (nam truoc)) va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach y)) nang cao hoc. lieu va ((nam truc) OR (nam truoc)) va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach y)) nang cao hoc. lieu va ((nam truc) OR (nam truoc)) va hanh vi cuu tre*.