Perhaps you should try some spelling variations:
thien van » thi van
sach ky » sac ky, sach ty, sach kem
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach ky) OR (sach y)) tang xa hoi. ((hieu ve) or (thien van)) cam duc va dan di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach y)) tang xa hoi. ((hieu ve) OR (thien van)) cam duc va dan di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sach y)) tang xa hoi. ((hieu ve) or (thien van)) cam duc va dan di cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sach y)) tang xa hoi. ((hieu ve) or (thien van)) cam duc va dan di cuu tre*.