Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cua tuc » cua duc, cua tu, cua thuoc
hac duc » hoc duc, thach duc, pham duc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ha duc » ho duc, ha dac, xa duc
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. hieu va ((hac duc) OR (ha duc)) ((van hanh) OR (ban hanh)) di cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. hieu va ((hac duc) OR (ha duc)) ((van hanh) or (ban hanh)) di cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. hieu va ((hac duc) OR (ha duc)) ((van hanh) or (ban hanh)) di cua tuc*.