Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
nhan luc » nang luc
lang van » dang van, tang van, hoang van
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
di cua » dai cua, doi cua, de cua
ha luc » ha duc, than luc
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach o lang van hoi. hieu quan ((ha luc) OR (nhan luc)) va hanh di cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach o lang van hoi. hieu quan ((ha luc) OR (nhan luc)) va hanh di cua te*.