Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hai cua » thai cua, dai cua, hoi cua
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach vay
loc va » hoc va, luc va
sach 2 » sach y
x hoi » xa hoi, o hoi, x ho

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 v) OR (sach 2)) nang x hoi. hieu va tham ((duc va) or (loc va)) nhanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach v) OR (sach 2)) nang x hoi. hieu va tham ((duc va) OR (loc va)) nhanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach v) OR (sach 2)) nang x hoi. hieu va tham ((duc va) or (loc va)) nhanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach v) OR (sach 2)) nang x hoi. hieu va tham ((duc va) or (loc va)) nhanh hai cua tre*.