Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
dan tai » van tai, dan thi, han tai
hieu va » lieu va, hieu qua
hieu ve » hieu van
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
cuc tre » duc tre, cua tre, cuu tre
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ty nang cao hoi. ((hieu ve) OR (hieu va)) cam xuc va dan tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang cao hoi. ((hieu ve) OR (hieu va)) cam xuc va dan tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ty nang cao hoi. ((hieu ve) OR (hieu va)) cam xuc va dan tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty nang cao hoi. ((hieu ve) OR (hieu va)) cam xuc va dan tai cuc tre*.