Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
cam duc » cao duc, pham duc, nam duoc
su viet » so viet
vi su » va su, ve su, ki su

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 ky ((nang xa) or (nang x)) hoi. hieu va ((cam duc) OR (cam xuc)) manh hanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang x)) hoi. hieu va ((cam duc) OR (cam xuc)) manh hanh vi su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) or (nang x)) hoi. hieu va ((cam duc) OR (cam xuc)) manh hanh vi su viet*".