Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
tuc va » thuc va, truc va, tuc xa
vi su » va su, ve su, oi su
ki su » ky su

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 y lang xa hoi. ((hieu ve) or (hieu va)) cam tuc va hanh ((vi su) OR (ki su)) tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y lang xa hoi. ((hieu ve) OR (hieu va)) cam tuc va hanh ((vi su) OR (ki su)) tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y lang xa hoi. ((hieu ve) or (hieu va)) cam tuc va hanh ((vi su) OR (ki su)) tien".
• Adding a wildcard symbol may retrieve word variants: thu sach y lang xa hoi. ((hieu ve) or (hieu va)) cam tuc va hanh ((vi su) OR (ki su)) tien*.