Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
cham duc » pham duc, cham soc, pham duy
hanh hai » thanh hai, nhanh hai, hang hai
xang xa » lang xa, mang xa, ang xa
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua tu » cua tuc, cua su, cua cu

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) OR (toc sach)) ty xang xa hoi. ((hieu van) or (thien van)) cham duc va hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty xang xa hoi. ((hieu van) OR (thien van)) cham duc va hanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty xang xa hoi. ((hieu van) or (thien van)) cham duc va hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty xang xa hoi. ((hieu van) or (thien van)) cham duc va hanh hai cua tu*.