Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
tai cua » thai cua, tai cuc, dai cua
y nang » ky nang, ly nang, v nang
tuu va » tu va, tru va, thu va
cuu va » cuu van, cuu ve

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 y nang xa hoi. hieu va chat ((tuu va) OR (cuu va)) han ((tai cua) or (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu va chat ((tuu va) OR (cuu va)) han ((tai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu va chat ((tuu va) OR (cuu va)) han ((tai cua) or (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu va chat ((tuu va) OR (cuu va)) han ((tai cua) or (tri cua)) te*.