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
sang mai » sang ma, sang tai, hoang mai
lang mai » lang dai, lang hai, lang man
sach ty » sach y, sach tu, sach thu
luc van » luoc van, luu van, duc van
la tren » loai tren, dua tren, dat tren
ve cac » va cac, vien cac
vai la » tai la, vai va
ve cai » va cai, ve tai, ve cau

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 ((sang mai) or (lang mai)) hoi. hieu ((ve cai) or (ve cac)) luc van thanh vai la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((sang mai) OR (lang mai)) hoi. hieu ((ve cai) OR (ve cac)) luc van thanh vai la tren.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((sang mai) or (lang mai)) hoi. hieu ((ve cai) or (ve cac)) luc van thanh vai la tren*.