Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
vu sach » vu bach, su sach, vu khach
ma hoi » mai hoi, xa hoi, ma hoa
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) ly nang ma hoi. hieu van ((cham soc) or (cam xuc)) va hanh va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ly nang ma hoi. hieu van ((cham soc) OR (cam xuc)) va hanh va dau tren.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ly nang ma hoi. hieu van ((cham soc) or (cam xuc)) va hanh va dau tren*.