Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi dau » vi dai, va dau, bi dau

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) or (nang ma)) hoi. lieu va cham tuc va hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang ma)) hoi. lieu va cham tuc va hanh vi dau tren*.