Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
tai cua » thai cua, tai cuc, tri cua
tuc ban » thuc ban, truc ban, tu ban
vu cham » va cham, vu kham, tu cham
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((nang xa) OR (nang ma)) hoi. hieu ((vu cham) or (cao chat)) tuc ban hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang ma)) hoi. hieu ((vu cham) OR (cao chat)) tuc ban hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) OR (nang ma)) hoi. hieu ((vu cham) or (cao chat)) tuc ban hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) OR (nang ma)) hoi. hieu ((vu cham) or (cao chat)) tuc ban hanh tai cua tre*.