Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
luc van » luoc van, luu van, duc van
cao luc » bao luc, cao duc, cao suc
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va cao » va cac, va co, va dao
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) v nang mai hoi. hieu va cao luc van thanh ((di cua) or (de cua)) thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) v nang mai hoi. hieu va cao luc van thanh ((di cua) OR (de cua)) thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) v nang mai hoi. hieu va cao luc van thanh ((di cua) or (de cua)) thuoc*.