Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cham luc » cham soc, nhan luc, cham cuu
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va lanh » va lang, va danh, va hanh
dao cua » dai cua, day cua, dan cua
y mang » cay mang
luc va » duc va, tuc va, loc va

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 y mang may hoi. ((hieu va) or (hieu van)) cham luc va lanh dao cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y mang may hoi. ((hieu va) OR (hieu van)) cham luc va lanh dao cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach y mang may hoi. ((hieu va) or (hieu van)) cham luc va lanh dao cua viet*.