Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hanh vai » hanh vi, hanh va, hanh tai
cham tuc » nham thuc, pham thuc, tham thuc
hieu van » thien van, lieu va, hieu ve
dang xay » dang van, van xay
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cau » va cau, van cau, vai cac
tu sach » thu sach, su sach, te sach
tuc va » thuc va, truc va, tuc xa

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 ty ((dang xay) or (nang ma)) hoi. ((hieu van) or (hieu va)) cham tuc va hanh vai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((dang xay) OR (nang ma)) hoi. ((hieu van) OR (hieu va)) cham tuc va hanh vai cau theo.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((dang xay) or (nang ma)) hoi. ((hieu van) or (hieu va)) cham tuc va hanh vai cau theo*.