Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
tham duc » pham duc, tham du, than duc
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
sac ky » cac ky, sai ky
anh ki » anh kinh, anh kiem, anh kien

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach ty)) nang xa hoi. hieu van tham duc van anh ki ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach ty)) nang xa hoi. hieu van tham duc van anh ki ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sach ty)) nang xa hoi. hieu van tham duc van anh ki ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach ty)) nang xa hoi. hieu van tham duc van anh ki ((su triet) OR (ve triet))*.