Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
truc van » thuc van, truc ban, truc dan
tuan vai » tuan tai, trang vai, tuan khai
va trien » va truyen, va thiet, va tieng
va tuyen » va truyen, tac tuyen, ke tuyen
nang ma » tang ma, sang ma, nang cao
truc va » thuc va, thuc vat, trung va
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ma hoi. lieu va cac ((truc van) OR (truc va)) tuan vai ((va trien) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ma hoi. lieu va cac ((truc van) OR (truc va)) tuan vai ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ma hoi. lieu va cac ((truc van) OR (truc va)) tuan vai ((va trien) or (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ma hoi. lieu va cac ((truc van) OR (truc va)) tuan vai ((va trien) or (va tuyen))*.