Perhaps you should try some spelling variations:
mai khoi » tai khoa, cac khoi, dai khoa
mai khoa » tai khoa, may khoa, dai khoa
te sach » toc sach
nang va » nang van, hang va, nang ma
va nang » van nang, da nang, cam nang
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cua tuc » cua duc, cua thuoc, luat tuc
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
cua tu » cua su, cua cu, cua te

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 ty nang ((mai khoi) or (mai khoa)). hieu va cam xuc va nang va ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((mai khoi) OR (mai khoa)). hieu va cam xuc va nang va ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((mai khoi) or (mai khoa)). hieu va cam xuc va nang va ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((mai khoi) or (mai khoa)). hieu va cam xuc va nang va ((cua tu) OR (cua tuc))*.