Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
tu tren » tu truyen, tu tieng, tu trong
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
va tu » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo ((sach ky) OR (sac ky)) nang x hoi. hieu van ((cham soc) or (cam xuc)) va hanh va tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo ((sach ky) OR (sac ky)) nang x hoi. hieu van ((cham soc) OR (cam xuc)) va hanh va tu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo ((sach ky) OR (sac ky)) nang x hoi. hieu van ((cham soc) or (cam xuc)) va hanh va tu tren".
• Adding a wildcard symbol may retrieve word variants: bo ((sach ky) OR (sac ky)) nang x hoi. hieu van ((cham soc) or (cam xuc)) va hanh va tu tren*.