Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, va hanh
sai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
o hoc » co hoc, mo hoc, so hoc

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 (thuat sach)) ky nang o hoc. hieu van cam xuc va danh ((sai cua) OR (hai cua)) thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang o hoc. hieu van cam xuc va danh ((sai cua) OR (hai cua)) thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky nang o hoc. hieu van cam xuc va danh ((sai cua) OR (hai cua)) thuoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang o hoc. hieu van cam xuc va danh ((sai cua) OR (hai cua)) thuoc*.