Perhaps you should try some spelling variations:
phap hoc » phap hoan, phap mo, phap han
phat hoc » phau hoc, chat hoc, vat hoc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
manh le » thanh le
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
anh le » oanh le, anh ve, thanh le

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ma hoi. hieu va ((phat hoc) or (phap hoc)) tuan ((anh le) OR (manh le)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu va ((phat hoc) OR (phap hoc)) tuan ((anh le) OR (manh le)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu va ((phat hoc) or (phap hoc)) tuan ((anh le) OR (manh le)) cuu tre*".