Perhaps you should try some spelling variations:
sang lao » sang tao, sang lap, tang lao
lao khoa » lo khoa, da khoa, ly khoa
te sach » toc sach
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
ty sang » ty xang, ty hang, duy sang
vai cua » dai cua, hai cua, lai cua
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu cua

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 sang lao khoa. ((hieu ve) or (hieu va)) cau luc va danh ((de cua) or (vai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty sang lao khoa. ((hieu ve) OR (hieu va)) cau luc va danh ((de cua) OR (vai cua)) vat.
• Adding a wildcard symbol may retrieve word variants: te sach ty sang lao khoa. ((hieu ve) or (hieu va)) cau luc va danh ((de cua) or (vai cua)) vat*.