Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh tai » thanh hai, doanh tai, thanh san
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
cam lo » cam ly, cam o
nam lo » nam bo, nam so, nam co
ma hoi » mai hoi, xa hoi, ma hoa

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 ly nang ma hoi. hieu va ((cam lo) or (nam lo)) va ((thanh tai) or (thanh toan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ma hoi. hieu va ((cam lo) OR (nam lo)) va ((thanh tai) OR (thanh toan)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ma hoi. hieu va ((cam lo) or (nam lo)) va ((thanh tai) or (thanh toan)) cua tre*.