Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
thu lang » thu hang, thu bang, phu lang
dinh tri » chinh tri
duc van » duc va, duc tan, duc manh
thi van » thi lan, thi hanh, thi nang
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
lang xa » lang ha, dang xay, lang van
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (hoc sach)) thu lang xa hoi. thi van lam duc van ((dinh thi) OR (dinh tri)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (hoc sach)) thu lang xa hoi. thi van lam duc van ((dinh thi) OR (dinh tri)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (hoc sach)) thu lang xa hoi. thi van lam duc van ((dinh thi) OR (dinh tri)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (hoc sach)) thu lang xa hoi. thi van lam duc van ((dinh thi) OR (dinh tri)) cuc tre*.