Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
va thanh » gia thanh, ban thanh, va tinh
qua chat » qua nhat, qua cham, luan chat
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, hai va, lai va
dai va » mai va
thiet* » thieu*

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 ty nang ma hoi. hieu qua chat xuc ((van hanh) or (va thanh)) ((vai va) OR (dai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu qua chat xuc ((van hanh) OR (va thanh)) ((vai va) OR (dai va)) thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. hieu qua chat xuc ((van hanh) or (va thanh)) ((vai va) OR (dai va)) thiet*".