Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
thu sach » tu sach, thuoc sach, thu hoach
lang man » lang van, lang ban, lang mai
luc van » luoc van, luu van, duc van
va tren » va trien, van tren, va tre
man hoi » man hoai, dan hoi, van hoi
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
vai va » mai va, dai va, hai va
ve cau » ke cau, va cau, le cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuat sach)) ky lang man hoi. hieu ((ve cau) or (ve cac)) luc van thanh vai va tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky lang man hoi. hieu ((ve cau) OR (ve cac)) luc van thanh vai va tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ky lang man hoi. hieu ((ve cau) or (ve cac)) luc van thanh vai va tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ky lang man hoi. hieu ((ve cau) or (ve cac)) luc van thanh vai va tren*.