Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
te sach » toc sach
hieu su » hieu sau, tieu su, hieu so
dau cua » day cua, cau cua, dan cua
y nang » ky nang, ly nang, v nang
su cam » su nam, su cao, su can
va dan » ca dan, va dao, va dap
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang cau hoi. hieu su cam xuc ((va dan) OR (va dau)) ((dau cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang cau hoi. hieu su cam xuc ((va dan) OR (va dau)) ((dau cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang cau hoi. hieu su cam xuc ((va dan) OR (va dau)) ((dau cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach y nang cau hoi. hieu su cam xuc ((va dan) OR (va dau)) ((dau cua) or (dai cua)) te*.