Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sach va » sach xa, sach ha, sach dao
cuc tre » duc tre, cua tre, cuu tre
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach y, sach 2, sach vay
ve lam » va lam, de lam, se lam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach v) or (sach va)) nang ma hoi. hieu ve lam truoc ((va hanh) OR (van hanh)) tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach v) OR (sach va)) nang ma hoi. hieu ve lam truoc ((va hanh) OR (van hanh)) tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach v) or (sach va)) nang ma hoi. hieu ve lam truoc ((va hanh) OR (van hanh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach v) or (sach va)) nang ma hoi. hieu ve lam truoc ((va hanh) OR (van hanh)) tai cuc tre*.