Perhaps you should try some spelling variations:
hanh cac » hang cac, hanh cat, nhanh cay
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cham lo » cam lo, cham soc, cham hoi
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
sang ma » nang ma, sang tao, mang may
su tien » su kien, su hien, tu tieng
cham o » cham soc
cac su » cach su, cac sau, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((sang ma) or (tang ma)) hoi. hieu va ((cham lo) or (cham o)) va hanh cac su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((sang ma) OR (tang ma)) hoi. hieu va ((cham lo) OR (cham o)) va hanh cac su tien.
• Adding a wildcard symbol may retrieve word variants: su sach y ((sang ma) or (tang ma)) hoi. hieu va ((cham lo) or (cham o)) va hanh cac su tien*.