Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van ban
dong hoa » dong hoc, dong co
van anh » van thanh, tuan anh, van minh
cam luc » cam xuc, cau luc
sach ty » sach y, sach tu, sach thu
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
vu ve » vu le, vu va, su ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sac ky)) dong hoa hoi. hieu ve cam luc ((van hanh) or (van anh)) vu ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sac ky)) dong hoa hoi. hieu ve cam luc ((van hanh) OR (van anh)) vu ve triet.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sac ky)) dong hoa hoi. hieu ve cam luc ((van hanh) or (van anh)) vu ve triet*.