Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
hang dai » hoang dai, hang tai, hang dau
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
nam duc » nam duoc, pham duc, nam thuc

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

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