Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
nam buoc » nam duoc, nam quoc, nam thuoc
gian cua » ban cua
sach ty » sach y, sach tu, sach thu
buoc xa » buc xa, duoc xa, uoc xa
xa hanh » xa thanh, xa khanh, va hanh

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 ty ((mang may) or (nang x)) hoi. hieu van nam buoc xa hanh ((gian cua) or (gian xu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((mang may) OR (nang x)) hoi. hieu van nam buoc xa hanh ((gian cua) OR (gian xu)) tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((mang may) or (nang x)) hoi. hieu van nam buoc xa hanh ((gian cua) or (gian xu)) tre*.