Perhaps you should try some spelling variations:
thien van » thi van
sach cao » sach dao, sach cap, mach cao
cao nang » cao dang, cam nang, cao tang
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
chu treo » cau treo, cau tren, chu tri
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
cu tren » tu tren, dua tren

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 cao nang x ho. ((hieu van) or (thien van)) cam xuc van hanh hai ((chu treo) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach cao nang x ho. ((hieu van) OR (thien van)) cam xuc van hanh hai ((chu treo) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach cao nang x ho. ((hieu van) or (thien van)) cam xuc van hanh hai ((chu treo) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: su sach cao nang x ho. ((hieu van) or (thien van)) cam xuc van hanh hai ((chu treo) OR (cu tren))*.