Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hanh lai » hanh lam, hanh tai, thanh lap
cam viet » cham viet, ca viet, cao viet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
lai cam » lai nam, lai tam, lai chau
x hoi » xa hoi, o hoi, 5 hoi

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 ((x hoi) OR (x ho)). hieu va ((pham duy) or (pham duc)) manh hanh lai cam viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (x ho)). hieu va ((pham duy) OR (pham duc)) manh hanh lai cam viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (x ho)). hieu va ((pham duy) or (pham duc)) manh hanh lai cam viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (x ho)). hieu va ((pham duy) or (pham duc)) manh hanh lai cam viet*.